Free
styled-components
Open SourceEcosystem · CSS Tools
CSS-in-JS library for React with scoped, dynamic styles.
css-in-jsreactstyling
Browse the complete directory — use filters to narrow down.
Ecosystem · CSS Tools
CSS-in-JS library for React with scoped, dynamic styles.
Ecosystem · CSS Tools
The linter that keeps your CSS clean and consistent.
Frameworks · Frontend
Compiler-based UI framework with no virtual DOM and great DX.
Compression & Optimization · Image & Media
Node.js tool and library for optimizing SVG vector files.
Build & Lint · Frontend
Rust-based TypeScript/JavaScript compiler used by Next.js and friends.
Programming Languages
Official Swift.org open-source project site with docs and downloads.
Native · Mobile Development
Apple's declarative UI framework for all Apple platforms.
Frameworks · Backend
Mature PHP framework and set of reusable components.
Icons · Frontend
Over 5,800 free MIT-licensed stroke SVG icons with consistent 24px grid and packages for every framework.
Mobile UI Libraries · Mobile Development
UI and styling toolkit for React Native and web from one optimizing compiler — fast, themeable, typed.
State & Forms · Frontend
Headless utilities: TanStack Query, Table, Router, Form and more.
Data Viz & Charts · Frontend
Headless UI table/grid logic for React, Vue, Solid and Svelte — you own 100% of the markup and styling.
Desktop Apps · Frontend
Build tiny, secure desktop (and mobile) apps with any web frontend.
Practice & Challenges · Documentation & Learning
Free, curated interview prep: algorithms study plans, behavioral questions and resume advice by ex-Facebook engineers.
Unit & Component · Testing
Throwaway Docker containers for reliable integration tests.
Unit & Component · Testing
Test UI the way users interact with it; simple, complete bindings.
Animation · Frontend
Motion design tool with a visual editor that attaches to JavaScript — keyframe anything on the web.
3D & WebGL · Frontend
The JavaScript 3D library — WebGL scenes, materials, lights and cameras with an enormous ecosystem.
Terminals & Shells · Development Environment
Terminal multiplexer for persistent sessions, panes and windows.
Other Formats · Data Formats
Official TOML language site with spec, docs and editor support.
Data Viz & Charts · Frontend
React components and blocks built for dashboards — charts, KPI cards and grids on Tailwind.
Dependency Security · Security
All-in-one open-source vulnerability and misconfiguration scanner.
API Protocols · Backend
End-to-end typesafe APIs without schemas or code generation.
Build & Lint · Frontend
High-performance build system and cache for JavaScript monorepos.