Free
Bootstrap Icons
Open SourceIcons · Frontend
Free, high-quality SVG icon library from the Bootstrap team with 2,000+ glyphs — works far beyond Bootstrap.
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Icons · Frontend
Free, high-quality SVG icon library from the Bootstrap team with 2,000+ glyphs — works far beyond Bootstrap.
API Clients · API Tools
Fast, Git-friendly open-source API client that stores collections locally.
Architecture & Patterns · Project Starters
The popular open-source reference architecture for scalable React apps — folder structure, patterns and real conventions.
Queues & Streaming · Database
Robust Redis-backed job queue for Node.js.
Ecosystem · CSS Tools
Flexbox-based CSS framework with no JavaScript — readable class syntax and modular imports.
Frameworks · Backend
All-in-one JavaScript runtime, bundler, test runner and package manager.
Programming Languages
Comprehensive C language and standard library reference.
Programming Languages
Official C# documentation from Microsoft.
Programming Languages
Comprehensive C++ language and standard library reference.
Web Servers & Proxies · DevOps
Web server with automatic HTTPS and simple configuration.
Scheduling & Booking · API Tools
Open-source scheduling infrastructure — Calendly alternative with booking links, teams and an API you can self-host.
Learning & Reference · CSS Tools
Browser support tables for HTML, CSS and JavaScript features.
Cross-Platform · Mobile Development
Run web apps natively on iOS, Android and the web.
Design Systems · Design & Prototyping
IBM's open-source design system for products and experiences.
Text & Diff · Developer Utilities
Create and share beautiful images of your source code.
Queues & Streaming · Database
The classic Python distributed task queue — async jobs, schedules and workflows on RabbitMQ or Redis.
UI Libraries · Frontend
Accessible, themeable React component system with style props.
Data Viz & Charts · Frontend
Simple, canvas-based charting for the web — eight chart types with sensible defaults and plugins.
Package Managers · Development Environment
Package manager for Windows built on NuGet infrastructure.
Vector Databases · AI for Developers
Open-source embedding database designed for local-first AI apps.
Browser DevTools · Development Environment
The browser console's full documentation — elements, network, performance, memory and Lighthouse panels.
NoSQL · Database
Blazing-fast columnar database for real-time analytics.
AI Coding Assistants · AI for Developers
Open-source autonomous coding agent as a VS Code extension.
Generators · CSS Tools
Visual clip-path shape maker generating CSS polygon values.