Free
Autoprefixer
Open SourceEcosystem · CSS Tools
PostCSS plugin that adds vendor prefixes using Can I Use data.
cssprefixescompatibility
Browse the complete directory — use filters to narrow down.
Ecosystem · CSS Tools
PostCSS plugin that adds vendor prefixes using Can I Use data.
Hyperscalers · Cloud Platforms
Amazon Web Services: the largest cloud platform with 200+ services.
Inspiration & Galleries · Design & Prototyping
Awards panel ranking the most innovative web design — the frontier of what the web can look like.
Accessibility · Testing
Industry-standard accessibility testing engine and browser tools.
Frameworks · Backend
Ergonomic, modular Rust web framework built on Tokio.
Whiteboards & Diagrams · Design & Prototyping
Low-fidelity wireframing that keeps the focus on structure.
UI Libraries · Frontend
Headless React components from the Material UI team — unstyled primitives with strong accessibility.
Converters · Encoding & Decoding
Simple, fast online Base64 decoder and encoder.
Converters · Encoding & Decoding
Base64 encode and decode for text, files, URLs and images.
Programming Languages
Official GNU Bash shell website with manual and downloads.
CLI Tools · Development Environment
cat clone with syntax highlighting and Git integration.
GUI Clients · Database
Open-source, easy-to-use SQL editor and database GUI.
Authentication · API Tools
Framework-agnostic TypeScript authentication library (trending).
Uptime & Alerting · Monitoring & Observability
Uptime monitoring, incident management and log management in one.
Build & Lint · Frontend
One fast Rust toolchain for linting, formatting and more (trending).
Hosting & Collaboration · Git & Version Control
Atlassian Git hosting with deep Jira integration.
Passwords & IDs · Security
Open-source password manager with a free generator and vault.
Illustrations & Assets · Design & Prototyping
Customizable illustrations from global artists — compose scenes in the browser and export to PNG or SVG.
AI Coding Assistants · AI for Developers
Prompt, run, edit and deploy full-stack web apps in the browser.
Offline Toolkits · Developer Utilities
A scriptable scratchpad for macOS with 100+ built-in text transformations — paste, transform, copy back.
UI Libraries · Frontend
The classic CSS framework with components, grid and utilities.
Icons · Frontend
Free, high-quality SVG icon library from the Bootstrap team with 2,000+ glyphs — works far beyond Bootstrap.
E2E & Browser · Testing
Test on real browsers and devices in the cloud.
API Clients · API Tools
Fast, Git-friendly open-source API client that stores collections locally.