Free
Puppeteer
Open SourceE2E & Browser · Testing
Node.js library to control Chrome via the DevTools Protocol.
browserautomationscrapingchrome
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E2E & Browser · Testing
Node.js library to control Chrome via the DevTools Protocol.
Package Managers · Development Environment
Simple Python version management for local and global interpreters.
Unit & Component · Testing
The de-facto testing framework for Python: plain asserts, powerful fixtures and a rich plugin ecosystem.
Vector Databases · AI for Developers
Open-source vector database written in Rust, with cloud offering.
UI Libraries · Frontend
Vue framework that targets SPA, PWA, SSR, mobile (Capacitor) and desktop (Electron) from one codebase.
Cheatsheets · Documentation & Learning
Clean, searchable cheat sheet collection for developers.
JSON · Data Formats
Generate types and serializers from JSON: TypeScript, Java, Kotlin, Go and more.
Models & LLM APIs · AI for Developers
Alibaba's open-weight model family with multilingual strengths.
Frameworks · Frontend
Resumable framework with lazy execution for near-instant loads.
Programming Languages
Official R project site for statistical computing and graphics.
Queues & Streaming · Database
Reliable, widely-deployed message broker with AMQP.
UI Libraries · Frontend
Unstyled, accessible React primitives for building design systems.
Wallets & Infrastructure · Web3 & Blockchain
The best-in-class React wallet-connect modal — beautiful UX over wagmi with multi-wallet support.
UI Libraries · Frontend
Adobe's headless hooks and components that bake in accessibility, keyboard and internationalization.
Browser DevTools · Development Environment
Official React extension to inspect component trees, props and state in the browser or standalone.
State & Forms · Frontend
Performant, flexible forms library for React with easy validation.
Cross-Platform · Mobile Development
Build native mobile apps using React and JavaScript.
Mobile UI Libraries · Mobile Development
Material Design component library for React Native with theming, dark mode and icon sets included.
Frameworks · Frontend
The standard router for React, now a full framework (v7).
Animation · Frontend
Physics-based animation library for React — springs instead of durations for natural motion.
3D & WebGL · Frontend
A React renderer for Three.js — build scenes declaratively with components, hooks and the pmnd ecosystem.
Data Viz & Charts · Frontend
Composable charting library for React built on SVG with a declarative, component-based API.
Launchers & Automation · Developer Utilities
Free, open-source macOS window manager — snap and resize windows with keyboard shortcuts.
API Documentation · API Tools
OpenAPI linting, bundling and three-panel reference docs.