Browse All Free Developer Tools

Zero-leak secret interception, deterministic Shannon entropy tokenization, AST shell command sandbox, and CI/CD security gate for Claude Code, Cursor, and autonomous AI agents.

Get up and running with Llama 3.3, Mistral, Qwen, and other large language models locally with a simple CLI and REST API.

A high-throughput and memory-efficient inference and serving engine for LLMs with PagedAttention.

Command-line orchestrator for AI coding agents: runs Claude Code, Codex CLI, and Gemini CLI in parallel git worktrees with Kanban task state, typed merge flows, and per-agent skills.

Local, OpenAI-compatible REST API for running LLMs, audio transcription, image generation, and embeddings on commodity CPU/GPU.

The all-in-one Desktop & Docker AI application with full RAG pipeline, multi-agent workspaces, and complete privacy.

Open-source desktop alternative to ChatGPT that runs 100% offline on local hardware with zero data leakage.

High-performance LLM inference in pure C/C++ with minimal setup and state-of-the-art quantization across Apple Silicon and GPUs.

Call 100+ LLM APIs using the standardized OpenAI input/output format with load balancing, proxy, and spend tracking.

100% private, local document question and answering engine using open LLMs without internet connection or data leaks.

Open-source ecosystem of consumer hardware-optimized LLMs running locally with desktop client and Python bindings.

Open-source, personal AI second brain that searches, reasons over, and answers questions from your personal docs and notes.

The AI-native open-source embedding database with simple Python and JavaScript client SDKs.

Vector similarity search engine with extended filtering support, payload indexing, and high-performance Rust core.

Cloud-native open-source vector database built for massive scale similarity search and AI vector retrieval.

Open-source vector database that stores both objects and vectors, allowing for seamless hybrid search.

Transformer-based text-to-audio model created by Suno that can generate highly realistic speech, music, and ambient noise.

High-performance inference of OpenAI's Whisper automatic speech recognition in pure C/C++ without external dependencies.

The most powerful and modular stable diffusion GUI and backend with graph/nodes-based workflow interface.

Hugging Face's production-ready toolkit for deploying and serving Large Language Models at scale with Tensor Parallelism.

Fast serving engine for large language models and vision-language models with RadixAttention for multi-turn caching.

NVIDIA's specialized library providing state-of-the-art acceleration and optimized execution for LLM inference.

Fast inference library for running local LLMs on modern NVIDIA GPUs with EXL2 quantization.

Distribute and run LLMs with a single multi-GB binary that runs across Windows, macOS, Linux, and FreeBSD.

High-throughput, memory-efficient LLM inference engine supporting many architectures and quantizations.

Finetune Llama 3.3, Mistral, and Qwen 2x-5x faster with 70% less memory using optimized hand-written GPU kernels.

Post-training framework for fine-tuning hundreds of open-source language models with standard YAML configurations.

Unified web UI and CLI for easy fine-tuning and evaluation of 100+ LLMs and multi-modal models.

Activation-aware Weight Quantization package for 4-bit LLM quantization with 3x speedup.

Easy-to-use LLMs quantization package with user-friendly APIs, based on GPTQ algorithm.

Accessible 8-bit and 4-bit optimizers and quantization functions for deep learning on CUDA and ROCm.

Hugging Face's state-of-the-art Parameter-Efficient Fine-Tuning library (LoRA, QLoRA, Prefix Tuning).

Transformer Reinforcement Learning library with Supervised Fine-Tuning (SFT), DPO, and PPO training loops.

The ubiquitous browser interface for Stable Diffusion based on Gradio library with extensive extensions.

Professional generative AI engine and canvas for creative visual artists and digital designers.

Focus on prompting and generating without complex parameter tuning, inspired by Midjourney simplicity.

Visual instruction tuning toward large multimodal models: chat and reasoning over high-res images.

Meta's foundation model for image segmentation, allowing promptable cutouts of any object with one click.

Ultralytics YOLOv8 for real-time object detection, image segmentation, pose estimation, and classification.

Awesome multilingual OCR toolkits supporting 80+ languages, table recognition, and document structure analysis.

Lightweight, open-weight text-to-speech model producing studio-grade human voices with only 82M parameters.

Fast, local neural text to speech system that sounds great and is optimized for Raspberry Pi and low-power hardware.

A generative text-to-speech model specifically designed for conversational scenarios and dialogue synthesis.

Reimplementation of OpenAI's Whisper model using CTranslate2, delivering up to 4x faster transcription.

Open-source vector similarity search extension for PostgreSQL, supporting exact and approximate nearest neighbor.

Meta's library for efficient similarity search and clustering of dense vectors, indexing billions of vectors on GPUs.

Developer-friendly, serverless open-source vector database for multi-modal AI with zero-copy storage.

The open big data serving engine: store, search, organize, and machine-learn over large vector and text datasets in real-time.

Spotify's C++ library with Python bindings to search for points in space that are close to a given query point.

Intel's advanced weight-only quantization algorithm for low-bit LLM optimization without accuracy degradation.

An open platform for training, serving, and evaluating LLM-based chatbots, the core engine behind LMSYS Chatbot Arena.

Semantic cache for LLM queries to cut costs and speed up response time up to 10x using vector similarity.

An open-source LLM app development platform combining AI workflow, RAG pipeline, agent capabilities, and model management.

Drag & drop user interface for building customized LLM applications, autonomous agents, and RAG pipelines.

Dynamic visual framework for building, testing, and deploying multi-agent AI and RAG applications.

Data framework for connecting enterprise custom data sources and knowledge bases to Large Language Models.

Standard open-source framework for building context-aware reasoning applications, agents, and multi-agent systems.

Structured data extraction from LLMs powered by Pydantic with validation, retries, and streaming support.

Platform for customizing AI models directly on top of real-time enterprise data engines using SQL queries.

Privacy-respecting open-source metasearch engine ideal for grounding AI models and retrieval-augmented generation.

Next-generation open-source RAG engine based on deep document understanding to extract structured data from complex files.

The memory layer for personalized AI assistants and autonomous agents, improving retention over time.

Cutting-edge framework for orchestrating role-playing, autonomous AI agents to collaborate seamlessly.

Microsoft's multi-agent conversation framework for building advanced AI agent workflows and collaborative task execution.

Multi-agent framework assigning distinct software company roles (Product Manager, Architect, Engineer) to LLMs.

Virtual software company simulated by communicative agents to complete full lifecycle software development.

Evaluation framework for your Retrieval Augmented Generation (RAG) pipelines with faithfulness metrics.

The open-source LLM evaluation framework like Pytest for LLM applications with 14+ benchmark metrics.

NVIDIA's toolkit for easily adding programmable guardrails and safety bounds to LLM-based conversational apps.

A guidance language for controlling large language models with interleaved generation, prompting, and constrain.

Structured text generation library with regular expressions, JSON schemas, and context-free grammars.

Test your prompts, agents, and RAGs against red-teaming attacks, prompt injections, and regression suites.

A query language for programming Large Language Models with typed output constraints and distribution control.

Stanford framework for programming—rather than prompting—foundation models with automatic prompt optimization.

User-friendly AI interface designed for self-hosting with complete Ollama and OpenAI-compatible API support.

Enhanced, self-hostable open-source AI chat platform unifying OpenAI, Anthropic, Gemini, and local LLMs.

Open-source prompt and automation framework for augmenting humans using AI patterns and modular CLI tooling.

AI pair programming in your terminal: edit code in local git repos with Claude 3.5 Sonnet, GPT-4o, or local LLMs with auto-commits.

Open-source platform for software development agents that can write code, fix bugs, run bash commands, and browse documentation autonomously.

Leading open-source AI code assistant inside VS Code and JetBrains: bring your own models, embeddings, and context providers.

Self-hosted AI coding assistant alternative to GitHub Copilot with local model execution and editor plugins.

Open-source, local-first code interpreter that lets LLMs run Python, JavaScript, and Bash code on your computer.

Autonomous AI agent platform empowering developers to create, test, and deploy customized AI agent chains.

Dev-first open source autonomous AI agent framework with GUI, agent telemetry, concurrent agents, and marketplace.

Pioneering AI-powered task management and autonomous agent execution system that builds on task completion loops.

Open-source code generation system integrating dynamic execution feedback and compiler outputs for iterative code refinement.

Autonomous software engineering agent that turns LM models into autonomous agents solving GitHub issues.

Open-source MCP server connecting AI assistants to Dubai and UAE public APIs — real estate, transport, statistics, education, health, and business data via Dubai Pulse, RTA, DLD, KHDA, and DHA. Runs locally over stdio.

Free, MIT-licensed plugins for Claude Code covering maintained codebase maps, project rules, coding-work orchestration, capability discovery, model routing, and local observability. Developers can install individual plugins rather than the entire collection; Claude or model-provider usage may have its own costs.

Open-source project workspace for teams and AI agents, with task delegation, persistent sandbox workspaces, and deliverable review. Self-hosting uses separately configured model-provider credentials.

Local-first & privacy-hardened AI Git commit intelligence with Conventional Commits, AST secret redaction, atomic hunk splitting, and 1-click VS Code extension.

Simple, fast terminal UI for git commands with interactive rebasing and visual diff navigation.

A syntax-highlighting pager for git, diff, and grep output with side-by-side views and line numbers.

GitHub's official command line tool to manage pull requests, issues, releases, and repository workflows.

GitLab's official open source CLI tool bringing GitLab features directly to your terminal.

Highly customizable changelog generator based on conventional commits and Git history.

Git repository summary information tool written in Rust that displays project stats directly in terminal.

Protect and discover secrets & sensitive data like passwords, API keys, and tokens in git repositories.

Find leaked credentials and secrets across git commit history, filesystems, and S3 buckets.

Compute various size metrics for a Git repository to detect large files, bloated commits, or excessive branches.

The commitizen command line utility that prompts developers for conventional commit messages.

Universal, high-speed bootable ISO/IMG USB writer with Rufus parity for Windows, macOS, and Linux. Streaming 4MB chunks, MBR/GPT, BIOS/UEFI, and simulation mode.

Resource monitor that shows usage and stats for processor, memory, disks, network, and processes with responsive graphs.

Disk Usage/Free utility, a colorful and user-friendly modern replacement for df.

Interactive cross-platform process viewer with colorful meters and process tree view.

Cross-platform system monitoring tool with web interface and REST API export.

Neofetch-like tool for fetching system information and displaying it prettily, written in pure C.

Disk usage analyzer with an ncurses interface, designed to find space hogs on remote servers.

Fast console disk usage analyzer with console GUI written in Go, specifically optimized for SSDs.

Terminal system monitor with zooming, historical graphs, process trees, and disk/network I/O tracking.

Terminal visual disk space navigator that visually maps out filesystems to locate large directories.

Full featured CLI system information tool designed for troubleshooting hardware and system configurations.

Open-source Windows performance utility built in Rust and egui. Features game detection, ETW FPS recording, safe tweak undo, and crash recovery without modifying game files.

Ultra-fast line-oriented search tool that recursively searches directories for a regex pattern while respecting gitignore.

A simple, fast, and user-friendly alternative to find with intuitive syntax and colorized terminal output.

Intuitive find & replace CLI, modern replacement for sed with regex and smart case support.

Command-line JSON processor: flexible, lightweight, and powerful slice, filter, and map utility.

Portable command-line YAML, JSON, XML, CSV, and properties processor written in Go.

Miller is like awk, sed, cut, join, and sort for name-indexed data such as CSV, TSV, and JSON.

A suite of command-line tools for converting to and working with CSV, the king of tabular formats.

Query and update data structures using selectors from the command line across JSON, YAML, TOML, and XML.

Execute SQL-like queries directly on CSV, TSV, and tabular text files without loading into a database.

A modern, maintained replacement for ls with colors, git status integration, icons, and tree views.

General-purpose command-line fuzzy finder with blazing speed and interactive shell bindings.

Cat clone with syntax highlighting and Git integration for dozens of programming languages.

The minimal, blazing-fast, and infinitely customizable cross-shell prompt for any shell (Bash, Zsh, Fish, PowerShell).

Blazingly fast CLI utility that counts code, lines, comments, and blank spaces across hundreds of programming languages.

Terminal JSON viewer and interactive streaming processor supporting JavaScript, Python, and Ruby one-liners.

Command-line JSON viewer designed for reading, exploring, and querying JSON objects with Vim-style navigation.

A tool for glamorous shell scripts with interactive prompts, file pickers, filters, and spin animations.

Write terminal GIFs as code, automatically testing and generating high-resolution recordings for documentation.

Terminal-based markdown reader designed for reading documentation directly in the shell with beautiful formatting.

Human-friendly, fast alternative to cut and awk with intuitive zero-indexed field selection.

Neural network-powered shell history search that prioritizes commands by directory context and exit status.

Blazingly fast terminal file manager written in Rust, based on async I/O with image preview support.

A terminal workspace and multiplexer with batteries included, floating panes, and WebAssembly plugin system.

Tiny, lightning-fast terminal file manager with disk usage analyzer, batch renamer, and app launcher.

VIM-inspired console file manager with multi-column display and automatic file preview.

A new way to see and navigate directory trees, find files, and launch commands quickly.

Fancy and modern terminal file manager with sleek UI, file previews, and keyboard navigation.

Terminal multiplexer that lets you switch easily between several programs in one terminal and detach sessions.

Magical shell history sync and search tool with SQLite database backing and end-to-end encryption.

Magnificent app that corrects errors in your previous console commands automatically.

Unclutter your .profile by loading and unloading environment variables depending on the current directory.

Terminal file manager written in Go, heavily inspired by ranger with faster startup and server/client architecture.

Open-source browser automation CLI for AI agents, with a fast Rust core and Node.js fallback for navigation, forms, screenshots, and structured page interaction.

Collaborative, simplified community man pages focusing on practical, real-world command examples.

Post-modern modal text editor built in Rust with built-in Language Server Protocol (LSP) and Tree-sitter syntax highlighting.

Front-end to your dev environment: polyglot runtime executor, environment variable manager, and task runner.

Multiple runtime version manager with a single CLI and unified configuration for Node.js, Python, Ruby, and more.

Fast, disk space efficient package manager using hard links and content-addressable storage.

Incredibly fast JavaScript and TypeScript runtime, bundler, test runner, and package manager written in Zig.

Secure runtime for JavaScript and TypeScript with built-in web standards and package management.

Universal markup converter that translates between Markdown, LaTeX, HTML, PDF, Docx, and 40+ formats.

Source code spell checker that finds and corrects typos in source code with low false positives.

Syntax-aware linter for prose and documentation supporting Google, Microsoft, and custom style guides.

The hassle-free JavaScript tool manager that automatically switches Node.js and package manager versions per project.

Command-line benchmarking tool with statistical analysis, warmup runs, and parametric sweeps.

A more intuitive version of du in Rust providing instant visual disk usage breakdown in terminal.

A modern replacement for ps with color highlighting, multi-column search, and process tree view.

Cross-platform graphical process and system monitor with customizable terminal charts and widgets.

The power of curl with the ease of use and human-friendly terminal output of HTTPie.

Modern, user-friendly command-line HTTP client for API debugging with clean JSON formatting, colorized output, and sessions.

Friendly and fast tool for sending HTTP requests with intuitive syntax, colorized output, and native curl translation.

Modern command-line DNS client with colorful output, support for DoH, DoT, and DNSCrypt protocols.

Ping, but with a live line graph rendering network latency trends right inside your terminal.

Terminal bandwidth utilization tool that sniffs network packets to determine process bandwidth usage.

Ultra-fast multi-protocol and multi-source command-line download utility (HTTP, HTTPS, FTP, BitTorrent).

Easily and securely send files or folders between any two computers using relay and end-to-end encryption.

Securely get things from one computer to another using short, human-pronounceable one-time codes.

A network diagnostic tool combining the functionality of traceroute and ping with interactive TUI.

An interactive, SSL-capable intercepting HTTP proxy for penetration testers and software developers.

Command-line client for WebSockets, like netcat or curl for ws:// and wss:// endpoints.

Like cURL, but for gRPC: command-line tool that lets you interact with gRPC servers via reflection.

Command line interface for testing internet bandwidth using speedtest.net servers without flash/browser.

Smarter cd command inspired by z and autojump: learns your navigation habits to jump to directories in fewer keystrokes.

Beautiful terminal user interface dashboard extension for GitHub CLI to manage pull requests and issues effortlessly.

Kubernetes CLI to manage your clusters in style, observe real-time events, and troubleshoot workloads.

Run your GitHub Actions locally inside Docker containers for fast, offline CI/CD pipeline iteration.

Tool for exploring a Docker image, layer contents, and discovering ways to shrink your image size.

A simple terminal UI for both Docker and docker-compose, written in Go with the gocui library.

Vulnerability scanner written in Go that checks your dependencies against the Open Source Vulnerability database.

Multi pod and container log tailing for Kubernetes with regex filtering and color-coded stream output.

Faster way to switch between clusters and namespaces in kubectl with fuzzy search integration.

The package manager for Kubernetes: define, install, and upgrade complex Kubernetes applications.

Customization of Kubernetes YAML configurations without templates, using patch layers and overlays.

Run Kubernetes locally on Windows, macOS, and Linux with automated cluster provisioning.

Kubernetes IN Docker: tool for running local Kubernetes clusters using Docker container nodes.

Top-like interface for container metrics, real-time memory and CPU consumption for Docker and Kubernetes.

Cross-platform terminal UI database management tool for PostgreSQL, MySQL, and SQLite.

Universal command-line interface for PostgreSQL, MySQL, SQLite, Oracle, ClickHouse, and 20+ database systems.

Postgres CLI with auto-completion and syntax highlighting, table formatting, and smart completions.

A terminal client for MySQL, MariaDB, and Percona with auto-completion and syntax highlighting.

A terminal client for Redis with auto-completion and syntax highlighting, command suggestions, and hints.

CLI for SQLite databases with auto-completion and syntax highlighting.

An independent, open-source Codex Desktop companion for Windows and macOS. It displays quota limits, reset times, and reset credits, with a local Quota Center for pace and history. I am a maintainer of this independent project; it is not affiliated with or endorsed by OpenAI.

Free MIT skill library and toolkit. A deterministic intake router assigns one specialist skill for agentic workflows.

Offline Node.js CLI that checks captured Lighthouse JSON against declared route-level performance budgets and reports a completed budget failure. It does not run Lighthouse or measure a live page.

Developer-alpha encrypted, append-only knowledge store with a Rust CLI and MCP server. Developers can sync signed records across devices and give agents scoped, expiring access to notes.

Offline Node.js CLI that checks exported HTML and local image files for declared dimensions, aspect ratio, alternative text, loading declarations, pinned format policy, and byte budgets. It reports pass, fail, or incomplete evidence; it does not optimize images or test live browser compatibility.

Offline Node.js CLI that checks Markdown and HTML links, local targets and anchors inside a bounded documentation root. It never fetches external URLs; without an imported status for them, the report stays incomplete rather than passing silently.

Offline Node.js CLI that checks examples in local JSON OpenAPI 3.0 and 3.1 descriptions against the schema for their operation and media type. It reports unsupported checks as incomplete instead of treating them as a pass.

Local-first TypeScript CLI and MCP toolkit for coding agents to compose, edit, and assemble videos from editable plan.json timelines. Core editing and transcription need no API keys; optional generation features use your own provider keys.

MIT-licensed publishing skills and MCP client configuration for coding agents to stage website files, review deployments, and track status. Enables direct website publishing from agent workflows without requiring code generation or a self-hosted server.

100% Free & Local-first agentic self-healing E2E test runner for Playwright. cloud cost with AST auto-patching and verification loop.

Self-improving QA agent for natural-language web and mobile tests, with a local dashboard and CLI.

Fast and reliable end-to-end testing framework for modern web apps across Chromium, Firefox, and WebKit.

Fast, easy, and reliable end-to-end testing framework for anything that runs in a web browser.

Accessibility testing engine for websites and HTML-based user interfaces with zero false positives.

Node.js library to automate Chromium browsers with a clear, human-readable API and smart element locators.

Google's Node.js library which provides a high-level API to control Chrome/Chromium over the DevTools Protocol.

Industry-standard browser automation framework and ecosystem supporting multiple browsers and programming languages.

Cross-platform automation framework for native, hybrid, and mobile web apps on iOS, Android, and Windows.

Painless mobile UI automation framework for Android and iOS with declarative YAML test flows.

Gray box end-to-end testing and automation library for React Native mobile applications.

Next-gen browser and mobile automation test framework for Node.js with native WebDriver and CDP support.

Integrated end-to-end testing framework powered by Node.js and W3C Webdriver API.

Automated accessibility testing tool that runs via CLI or Node.js to uncover WCAG compliance errors.

Catch visual regressions in web apps across responsive screen resolutions and DOM interactions.

The smallest, simplest and fastest JavaScript pixel-level image comparison library with anti-aliasing detection.

Visual regression testing for Storybook stories across Chrome and Android with Git diffs.

Open source visual regression testing engine for Storybook, Next.js, Ladle, and standalone websites.

Blazing fast Vite-native unit test framework with ESM, TypeScript, and out-of-the-box coverage.

Delightful JavaScript testing framework with a focus on simplicity, snapshots, and zero configuration.

Mutation testing framework for JavaScript and TypeScript to ensure your unit test suite actually catches bugs.

Java library that supports JUnit tests, providing lightweight throwaway instances of Docker databases.

Modern load testing tool, using Go and JavaScript, for testing system performance and reliability.

Cloud-scale load testing and functional testing platform for HTTP, WebSockets, and gRPC.

Scalable user load testing tool written in Python with real-time web monitoring UI.

Versatile HTTP load testing tool and library built in Go for drilling HTTP services with constant request rates.

Automated tool suite for running Lighthouse audits in CI/CD to prevent performance and accessibility regressions.

Fast HTTP/1.1 benchmarking tool written in Node.js, capable of generating massive request throughput.

High-performance load testing tool built on Akka and Netty with expressive DSL in Java, Kotlin, and Scala.

Apache's pure Java desktop application designed to load test functional behavior and measure performance.

Modern HTTP benchmarking tool capable of generating significant load when run on a single multi-core CPU.

Tiny and fast command line load generator for web applications, a modern replacement for ApacheBench (ab).

HTTP load testing tool written in Rust, inspired by Ansible syntax with support for benchmark assertions.

Fast, git-friendly, open-source API client that stores collections directly in your repo via plain text files.

Open-source API development ecosystem, lightweight web & desktop app with WebSocket, GraphQL, and SSE support.

Leading open-source API development and debugging platform for GraphQL, REST, WebSockets, and gRPC.

Postman's collection runner CLI allowing you to run and test Postman collections directly in CI/CD pipelines.

Java DSL for easy testing of REST services, bringing the simplicity of dynamic languages into Java.

The easiest and quickest way to design and run mock REST APIs locally with custom routes, rules, and proxies.

Seamless REST and GraphQL API mocking library for browser and Node.js using Service Worker API to intercept requests at the network level.

Flexible simulator and mock server for HTTP-based APIs with support for record/playback and stateful scenarios.

Open-source HTTP mock server that generates realistic mock servers directly from OpenAPI and JSON Schema specs.

Enables easy mocking of any system you integrate with via HTTP or HTTPS with expectations and verifications.

Get a full fake REST API with zero coding in less than 30 seconds from a single JSON file.

Generate massive amounts of realistic mock data in Node.js and the browser for robust testing environments.

High-performance Python library for generating realistic synthetic data in a variety of locales.

A simple and sane fake data generator for .NET languages, ported from Faker.js with fluent syntax.

Consumer-driven contract testing library for microservices, HTTP APIs, and asynchronous message queues.

Next-generation REST API automation testing framework for all levels in a test pyramid with mock support.

Unified open-source test automation framework combining API testing, mocks, performance testing, and UI automation.

Language-agnostic command-line tool for validating API description documents against backend implementation.

Modern API testing tool that finds crashes and bugs using property-based testing and OpenAPI specifications.

Comprehensive security scanner for container images, file systems, Git repositories, and Kubernetes manifests.

Fast, lightweight static analysis engine for finding bugs, enforcing secure coding standards, and auditing ASTs.

Continuous inspection engine for code quality, architectural hotspots, and security vulnerabilities across 30+ languages.

Static code analysis tool for infrastructure as code (Terraform, CloudFormation, Kubernetes, Dockerfile).

Smarter Dockerfile linter that helps you build best-practice Docker images by parsing AST rules.

Security linter designed to find common security issues in Python code using AST node analysis.

Static analysis tool which checks Ruby on Rails applications for security vulnerabilities.

Checks Python dependencies against known security vulnerabilities from CVE databases.

The world's most widely used web app scanner, free and open-source automated penetration testing tool.

Fast and customizable vulnerability scanner based on simple YAML-based templates from ProjectDiscovery.

Free weather forecast API for commercial and non-commercial use with hourly forecasts and historical weather data.

Completely free meteorological forecasting web service based on NOAA GFS numerical models with zero auth.

Free REST API providing sunrise, sunset, day length, and solar noon times for any coordinate.

Hourly particulate matter (PM2.5, PM10), ozone, and European Air Quality Index forecasts with zero auth.

Ultra-low latency open-source LLM inference API (Llama 3.3, DeepSeek, Qwen) with a generous free developer tier.

Instant serverless API access to 100,000+ open-source AI models across NLP, vision, and speech with free monthly quota.

Deterministic social caption and hashtag generator API returning platform-ready JSON. Features a permanent keyless playground endpoint for developers and AI agents.

Free fake REST API for prototyping, mock posts, comments, todos, and users with zero configuration.

A hosted REST-API ready to respond to your AJAX requests with simulated realistic user and auth data.

Free dummy REST API with products, carts, users, posts, comments, auth, and image placeholder endpoints.

Public directory and queryable dataset of over 9,000 accredited universities and domains worldwide.

Free, persistent key-value counter API to track page views, hits, and downloads without creating a database.

Predict someone's age from their first name based on international census records and demographic modeling.

Predict gender from first name with international probability scores and database of over 100M profiles.

Estimate nationality and origin country probabilities from given names using statistical country data.

Free API for generating realistic placeholder user data with photos, names, emails, and address models.

HTTP client testing service with endpoints for inspecting headers, status codes, methods, and payloads.

Inspect HTTP requests and webhooks with real-time payload logging and debugging.

Echo service to test REST clients, authorization headers, digest auth, and query parameters.

Free cloud storage for JSON data, ideal for prototyping frontend applications with mock backends.

Generate custom HTTP responses with custom bodies, headers, and status codes with zero backend setup.

Create mock API endpoints in 5 seconds to test incoming webhooks, payloads, and simulated responses.

Query Wikidata's linked open database using SPARQL queries to extract structured facts and entities.

Free HTTP microservice to generate customizable high-resolution QR codes on the fly in PNG and SVG.

Malicious URL feed and threat intelligence database for automated cybersecurity scanning.

K-anonymity search API checking password hashes against billions of compromised breach credentials securely.

GitHub API endpoint returning metadata, permissions, and conditions for popular open source licenses.

Predict gender from first name with probability scores and count statistics.

Predict age from first names based on statistical demographic modeling.

Predict nationality from names returning top country codes and confidence scores.

Queryable directory of hundreds of free public APIs categorized by topic and authentication requirements.

Real-time IP geolocation and network threat intelligence API returning JSON country, city, timezone, and ASN data.

Get detailed information about world countries (flags, borders, capitals, currencies, languages) via REST.

A simple public IP address API with guaranteed 99.99% uptime and zero setup.

Open-source search engine for OpenStreetMap data, providing forward and reverse geocoding.

Real-time IP geolocation API returning country, city, ISP, coordinates, and timezone in fast JSON format.

Free postal code and zip code geographic lookup API for 60+ countries worldwide with zero authentication.

Free batch forward and reverse geocoding API converting addresses to latitude/longitude coordinates.

Detailed world geographic facts, borders, regional groupings, currencies, and languages in JSON.

Fast IP address geolocation, ASN company lookup, and hostname resolution with generous free tier.

Reverse geocoding and IP client info API without usage limits for client-side web apps.

Live cryptocurrency prices, market cap, historical volume, exchange stats, and ticker data.

Reliable currency conversion and forex exchange rates for 160+ currencies with a permanent free tier.

Free and open-source foreign exchange rates and currency conversion API tracked by the European Central Bank.

Public lookup service for bank identification numbers (BIN/IIN) returning card brand, scheme, and country.

Cryptocurrency market data API delivering real-time quotes, global volume, and token metadata without keys.

Enterprise-grade digital asset prices and OHLCV historical charting data with free developer tier.

All the Pokémon data you'll ever need in one place, easily accessible through a modern RESTful API.

Free REST and GraphQL API providing hundreds of characters, episode guides, and location details from Rick and Morty.

TV show, episode guide, cast, and streaming schedule database accessible with zero authentication.

Community-built movie and TV database with metadata, posters, trailers, and cast biographies.

Comprehensive GraphQL API for discovering and tracking anime and manga with rich media relations.

Open-source REST API for MyAnimeList with caching, schedule endpoints, and character detail lookups.

Community-driven database of multiple choice trivia questions across 24 categories and difficulty levels.

Direct JSON endpoint to fetch xkcd comics, titles, transcripts, and image URLs.

Simulate shuffling, dealing, and playing cards from standard 52-card decks with persistent sessions.

Millions of book records, author bios, covers, and ISBN lookups from the Internet Archive.

Fast web API for Project Gutenberg's catalog of 70,000+ free public domain electronic books.

Free open-source English dictionary definitions, parts of speech, phonetics, and audio pronunciations.

Wikimedia official REST API providing page summaries, mobile views, image transforms, and search endpoints.

Search and retrieve millions of digitized books, movies, software, and audio files from the Internet Archive.

An internet database of public domain poetry accessible via clean REST endpoints.

Open-source REST API for famous historical and literary quotes filterable by author and tag.

Retrieve book cover images and author portraits using ISBN, OCLC, LCCN, or OLID identifiers.

Free developer-friendly English vocabulary API providing word origins, examples, and synonyms.

Public REST API providing random cat facts, breeds, and trivia with zero authentication required.

Free public REST API providing over 20,000 dog breed photos and random images with zero authentication required.

Curated JSON API providing satirical pop-culture developer jokes and trivia with search and category filters.

REST API that returns curated activity recommendations when you are bored, filterable by price and participants.

Simple API providing random pieces of advice and motivational suggestions with zero auth.

REST API to fetch random cat pictures and GIFs, with custom text and filter overlays.

Simple JSON API returning adorable random fox photographs and image links.

Public REST API providing curated photos of Shiba Inu dogs, birds, and cats.

Clean REST API providing programming, dark, and pun jokes with customizable category filters.

Random activity generator for boredom relief with accessibility, participants, and cost filters.

Random buzzword and corporate jargon phrase generator for humorous placeholders.

Humorous and sharp insults generation API for games and bot development.

Curated tech jokes, programming puns, and geek culture humor returned as clean JSON.

Free REST API delivering memorable quotes from Kanye West as JSON with zero setup.

Smart archive and quote retriever with meme tags and original source links.

Curated collection of high-resolution wild fox photos with zero rate limit.

Access imagery, mars rover photos, near earth asteroids, and astronomical telemetry data directly from NASA.

Real-time global seismic and earthquake event data from the United States Geological Survey in GeoJSON format.

Open-source REST and GraphQL API for historical rocket launches, Starlink satellites, and capsule telemetry.

Comprehensive rocket launch calendar tracking orbital missions and astronauts worldwide.

Structured database of physical and orbital characteristics for all planets, moons, and asteroids in our solar system.

Estimates carbon emissions from flights, electricity consumption, and shipping logistics with free tier.

Collaborative, open food database with over 3 million products containing barcodes, ingredients, allergens, and nutrition facts.

Free public dataset and REST API for breweries, cideries, and brewpubs across the United States and globally.

NOAA FishWatch database providing nutritional facts and sustainability data for seafood species.

Generate unique robot, alien, and monster avatar images for any hash, IP address, username, or text string.

Open-source avatar library and microservice for generating unique user profile avatars with 20+ design styles.

Returns top 100 popular meme image templates with dimensions and blank background assets.

Official Hacker News REST API powered by Firebase with real-time top stories, comments, and user profiles.

REST API for DEV Community (Forem) accessing articles, tag listings, user feeds, and comments.

Append .json to almost any public Reddit URL to get structured JSON post data and subreddit feeds.

Live air traffic surveillance data derived from global ADS-B receiver networks tracking flights in real time.

Free federal court rules, local rules, judge standing orders and filing deadlines, with a deadline calculator for every district.

Hosted MCP and REST API for official statistics by indicator, place and period. Each value includes a source citation. The free plan has 500 calls a month with no card; an MCP trial allows 25 calls a day per IP without an account.

Search indexed YouTube transcripts by topic, with source links and timestamps. Retrieve captions and resolve people, channels and videos. Coverage is partial. A permanent Free tier is available; Premium transcripts and sponsor research use paid plans.

Open source Firebase alternative providing PostgreSQL, Auth, Instant APIs, Realtime subscriptions, and Storage.

Serverless Postgres with instant branching, bottomless storage, and autoscaling compute to zero.

Open source backend in 1 file consisting of embedded SQLite database with real-time subscriptions, built-in auth, and admin dashboard.

Self-hosted backend-as-a-service platform providing developers with core APIs for authentication, databases, storage, and serverless functions.

Distributed SQLite database powered by libSQL designed for low-latency queries at the edge.

Serverless data platform providing Redis, Apache Kafka, and QStash with per-request pricing and instant scaling.

Real-time API and app dashboard layer for any SQL database with granular access control and event automation.

Open-source headless CMS delivering customizable REST and GraphQL APIs for web and mobile frontends.

Open-source vector database and similarity search engine for machine learning embeddings and semantic retrieval.

Managed cloud data platform offering permanent free tiers for PostgreSQL, MySQL, and OpenSearch.

Fully managed document database service with automated scaling, backups, and built-in security.

High-performance in-memory key-value database managed on AWS, GCP, and Azure.

Distributed, multi-region SQL database that scales automatically and ensures serializable ACID consistency.

Distributed, MySQL-compatible Hybrid Transactional/Analytical Processing (HTAP) database with serverless auto-scaling.

A modern, highly performant replacement for Redis and Memcached with 25x throughput and multi-threaded core.

Deploy serverless code instantly across Cloudflare's global edge network with ultra-low latency.

Run full-stack apps and databases close to your users globally with lightweight Firecracker microVMs.

Unified cloud to build and run web applications, APIs, static sites, and background workers with automated Git deploys.

Serverless platform to deploy full-stack apps and Docker containers globally with built-in CDN, SSL, and private networking.

Infrastructure platform where developers build, ship, and scale code without configuring servers.

Generous always-free cloud infrastructure: 4 Arm Ampere A1 cores, 24GB RAM, and 200GB block storage.

Globally distributed system that runs JavaScript, TypeScript, and WebAssembly at the edge with zero cold starts.

Frontend cloud platform providing seamless Git deployments, edge middleware, and serverless functions.

Platform for deploying modern web projects with automated Git workflows, serverless functions, and form handling.

Fast, secure, and free Jamstack platform for frontend developers running directly on Cloudflare edge.

Websites for you and your projects, hosted directly from your GitHub repository with automatic SSL.

Publish static websites directly from any repository on GitLab with integrated CI/CD pipelines.

Friendly community and instant web development environment where anyone can build, remix, and host full-stack apps.

Complete user management and authentication suite for React, Next.js, and modern full-stack web applications.

Complete open-source authentication library for Next.js, SvelteKit, Express, and modern frameworks with zero vendor lock-in.

Comprehensive TypeScript-first open-source authentication framework supporting multi-factor auth, organizations, and plugins.

Flexible and lightweight open-source authentication and session handling resource for modern web applications.

Open-source alternative to Auth0 and Firebase Auth providing passwordless, social login, session management, and user roles.

Modern open-source identity and access management infrastructure with OIDC, OAuth 2.0, and pre-built sign-in UI.

Open source identity and access management solution for modern applications and services, supporting OpenID Connect and SAML.

Open-source Identity Provider focused on flexibility and versatility with built-in user directory, MFA, and SSO.

Open-source authentication and authorization server providing 2-factor authentication and single sign-on for reverse proxies.

Open source identity infrastructure with turnkey authentication, audit logs, multi-tenancy, and passkeys.

Complete customer identity and access management system with fast setup and flexible user management APIs.

UI-first open-source Identity and Access Management (IAM) / Single-Sign-On (SSO) platform with web UI.

Cloud-native user management system and identity provider implementing login, registration, MFA, and social auth.

Developer-first email platform for sending transactional emails using clean React components.

Email marketing and transactional messaging platform with reliable delivery and webhook tracking.

Cloud-based email infrastructure platform with robust delivery APIs, template engines, and analytics.

Developer-first email delivery platform offering inbound routing, SPF/DKIM verification, and logs.

Self-hostable, open-source all-in-one alternative to Heroku, Netlify, and Vercel for applications, databases, and services.

Smallest PaaS implementation powered by Docker, allowing Git push-to-deploy on your own single server.

Extremely easy-to-use open-source app and database deployment platform with automated SSL and 1-click apps.

Proprietary self-hosted control panel for deploying applications and databases with Docker, automatic SSL and a browser interface.

Universal container management platform for Docker, Docker Swarm, and Kubernetes with clean web GUI.

Expose your web services easily and securely with automatic Let's Encrypt SSL certificates and web administration.

The leading cloud-native application proxy that integrates with your existing cluster and configures itself automatically.

Enterprise-ready, open source web server with automatic HTTPS written in pure Go.

Simple, personal cloud OS designed for home servers and self-hosting Docker apps with an elegant UI.

The ultimate personal home cloud server OS that lets you self-host Bitcoin, AI models, and nextcloud apps with 1 click.

Operating system aiming to simplify as much as possible the administration of a self-hosted server.

Open-source product analytics suite combining web analytics, session replays, feature flags, and survey tools.

Privacy-focused, cookie-free open-source web analytics platform with a fast and intuitive dashboard.

Open-source, self-hosted error tracking system compatible with Sentry client libraries and SDKs.

Lightweight and open-source Google Analytics alternative with zero cookies and full GDPR compliance.

The open and composable observability and data visualization platform with rich dashboards and alerts.

An open-source monitoring system with a dimensional data model, flexible query language, and alerting.

Self-hosted monitoring tool like Uptime Robot with modern dashboard and notifications across 90+ services.

High-performance, S3-compatible open-source object storage suite designed for high-density cloud data.

S3-compatible cloud object storage with ultra-low pricing and free bandwidth partnerships with Cloudflare.

European cloud provider offering multi-AZ S3-compatible object storage with generous free allowances.

Lightning-fast, typo-tolerant open-source search engine providing instant full-text search as you type.

Fast, typo-tolerant open-source search engine designed for delightful developer experience and sub-50ms search.

Most widely deployed open source message broker supporting AMQP, MQTT, and STOMP protocols.

Lightweight open-source message broker that implements the MQTT protocol versions 5.0, 3.1.1 and 3.1.

The world's most scalable open-source MQTT platform for connected IoT, automotive, and industrial devices.

Free All Products Pack subscription (IntelliJ IDEA Ultimate, WebStorm, PyCharm, CLion, GoLand) for open-source maintainers.

Free Postman Team subscription for open-source teams maintaining public APIs and workspaces.

Free monospaced coding font with toggleable OpenType ligatures; a no-ligature variant is also available.

Free monospaced font with programming ligatures; the ligatures change how code is rendered, not its underlying characters.

Free monospaced coding font with programming ligatures; Cascadia Mono is the variant without ligatures.

Free Sentry Business plan for qualifying open-source maintainers to monitor application health, errors, and real-time performance.

Free Datadog Pro infrastructure monitoring, log management, and APM for qualifying open-source projects.

Free BrowserStack testing license for open-source maintainers across 3,000+ real desktop and mobile browsers.

Free Docker Hub Team account with unlimited image pulls, public repositories, and automated security vulnerability scans.

Up to 20 seats of GitHub Enterprise free for 12 months, including GitHub Actions minutes, Advanced Security, and Copilot.

Free enterprise-grade CDN, DDoS protection, edge workers, and SSL certificate management for open-source initiatives.

Free 1Password Teams accounts for open-source project maintainers to securely share secrets and API tokens.

Free team plan with increased build minutes, bandwidth, and preview deployments for eligible open-source projects.

Free Pro sponsorship with elevated edge compute limits and team features for popular open-source projects.

Free top-tier GitLab Ultimate with 50,000 CI build minutes per month and security scanning for public open-source projects.

Free cloud subscriptions for Jira Software, Confluence, and Jira Service Management for qualifying open source initiatives.

Free unlimited code coverage reports and PR quality checks for public GitHub and GitLab repositories.

Free localization and translation management platform for open-source software projects and global documentation.

Free unlimited automated security scans for open source repositories, finding known vulnerabilities in code and packages.

Free AWS promotional cloud credits, technical support, and architectural guidance for early-stage builders and founders.

Access up to $2,000 in GCP credits in year one, covering Compute Engine, Cloud Run, Vertex AI, and BigQuery.

Monthly infrastructure credits to host open-source websites, build runners, test nodes, and documentation servers.

Free developer tools, cloud hosting credits (DigitalOcean, Azure), domain names, and GitHub Pro for verified students.

Up to $150,000 in Azure cloud credits, free access to OpenAI models, GitHub Enterprise, and LinkedIn tools for tech startups.

Up to $500 in Twilio communication API credits, sendgrid volume, and technical mentorship for early-stage software companies.

Up to $5,000 in MongoDB Atlas cloud database credits, dedicated technical advisory, and co-marketing opportunities.

Free individual annual subscription to all JetBrains IDEs (IntelliJ IDEA, WebStorm, PyCharm, CLion, Rider) for students.

Free Personal Pro plan for students and educators with unlimited file uploads, 30-day page history, and collaborative workspaces.

Free Figma and FigJam Professional tier for students, teachers, and accredited design classrooms.

Free Termius Pro SSH client for students with encrypted configuration sync, port forwarding, and SFTP browser.

Production-ready, highly customizable Astro template styled with Tailwind CSS, SEO-optimized, and built for speed.

Next-gen framework for building cross-browser web extensions with Manifest V3, TypeScript, and multi-browser support.

Production-ready Remix stack with SQLite database, Prisma ORM, user auth, Fly.io deployment, and end-to-end testing.

Interactive CLI to build full-stack, type-safe Next.js applications with Prisma, Tailwind CSS, and tRPC.

Opinionated, production-ready architecture guide and boilerplate for large-scale React enterprise applications.

Full-stack modern web application template using FastAPI, React, SQLModel, PostgreSQL, and Docker Compose.

Enterprise-grade Next.js boilerplate featuring Tailwind CSS, Radix UI, TypeScript, Jest, and Vitest.

High-performance monorepo starter kit for JavaScript and TypeScript with remote caching and parallel pipelines.

The modern headless CMS and application framework built directly inside Next.js with TypeScript and SQLite/Postgres.

Official template for creating full-stack Vue 3 and Nuxt applications with hybrid rendering and nitro engine.

Opinionated Vite starter template with file-based routing, auto-imported components, UnoCSS, and dark mode.

Cross-browser web extension starter template powered by Vite with Manifest V3 and Vue components.

Fully featured Node.js web framework with built-in ORM, auth, routing, and template engine, Laravel-like feel.

Instant open-source backend in 1 binary file with embedded SQLite database, real-time subscriptions, and auth rules.

Turn any SQL database into an instant real-time REST and GraphQL API engine with an intuitive no-code admin panel.

Robust full-stack starter featuring FastAPI, PostgreSQL, Docker Compose, Celery, and React frontend with JWT authentication.

Full-featured, privacy-first PDF manipulation suite to merge, split, OCR, redact, and sign PDFs with zero cloud tracking.

Clean Architecture template for Go RESTful services adhering to Uncle Bob's Clean Architecture principles.

Progressive Node.js starter template for building efficient, reliable, and scalable enterprise server applications.

Clean architecture boilerplate for FastAPI apps with asynchronous database sessions and dependency injection.

Bleeding edge, secure, and production-ready Django template with strict linting, Docker, and Celery support.

Clean Architecture template for Golang services with PostgreSQL, Docker Compose, and Swagger docs.

Ergonomic and modular web framework built with Tokio, Tower, and Hyper for blazing fast microservices.

Modern enterprise backend boilerplate with embedded Tomcat, Spring Data JPA, and actuator monitoring.

Fast, lightweight, web-standards based web framework for Cloudflare Workers, Fastly, Deno, Bun, and Node.js.

Ergonomic TypeScript web framework for Bun with end-to-end type safety and TypeBox validation.

Fast and low overhead web framework for Node.js with built-in schema-based JSON serialization.

Open-source Next.js application built with shadcn/ui components, NextAuth, Stripe, and PostgreSQL.

Production-grade starter kit for Next.js applications featuring Turborepo, Stripe billing, Clerk auth, and Prisma.

Open-source React-based framework for rapid development of data-intensive web applications, admin panels, and dashboards.

Modular, open-source commerce engine and Shopify alternative built with Node.js and customizable modules.

Open-source enterprise SaaS template with Next.js, Tailwind CSS, SAML SSO, Directory Sync, and multi-tenancy.

Minimal, responsive, accessible, and SEO-friendly Astro blog template with fuzzy search and dark mode.

Content-driven website template with island architecture, zero JavaScript by default, and Markdown/MDX.

Universal React Native application template running across iOS, Android, and web with file-based routing.

Build tiny, blazingly fast binaries for all major desktop and mobile platforms using web frontend and Rust backend.

Scalable desktop application template using Electron, React, TypeScript, and Webpack with hot reload.

Official multi-platform starter templates from Google Flutter covering state management and Material 3.

Full-featured, hackable Next.js AI chatbot built by Vercel using the AI SDK, Shadcn UI, and Neon Postgres.

Starter template for building full-stack LangChain applications with Next.js App Router and streaming responses.

Turn Python data scripts into shareable web applications in minutes with built-in charting and interactive widgets.

High-performance, multiplayer code editor written in Rust with built-in language intelligence and AI.

Fast formatter and linter for JavaScript, TypeScript, JSX, and JSON that aims to replace Prettier and ESLint.

A modern shell powered by a structured data pipeline that treats output as typed tables rather than text.

Fast and polyglot code search, linting, and rewrite tool using abstract syntax tree pattern matching.

GPU-accelerated cross-platform terminal emulator and multiplexer implemented in Rust.

Open-source secret management platform to sync configuration and secrets across infrastructure, CI/CD, and teams.

Scalable, open-source authorization policy engine for cloud applications and microservices.

An authorization library that supports access control models like ACL, RBAC, ABAC in Go and other languages.

Cloud cost estimates for Terraform in pull requests before deployment.

Community brainstorming and collaboration hub where developers propose, discuss, and build open-source projects.

Community-curated platform highlighting open-source projects with starter tasks to help new contributors dive in.

The freeCodeCamp.org open source codebase and curriculum helping millions learn to code globally.

Virtual whiteboard for sketching hand-drawn like diagrams with end-to-end encryption.

Scheduling infrastructure for everyone, the open-source Calendly alternative.

The open source DocuSign alternative: secure, digital document signing platform.

Building a modern, open-source alternative to Salesforce with clean UI and GraphQL APIs.

Turn your audience into a business: open-source modern publishing and membership platform.

Open-source customer engagement suite, alternative to Intercom and Zendesk.

Open source Notion alternative built with Flutter and Rust for privacy and offline-first workflows.

Next-gen collaborative knowledge base for tasks, whiteboards, and multi-modal documents.

Open-source link management infrastructure for modern marketing teams with custom domains and analytics.