Free
Solidity
Open SourceProgramming Languages
Official Solidity language site for Ethereum smart contracts.
solidityblockchainethereumsmart-contracts
Browse the complete directory — use filters to narrow down.
Programming Languages
Official Solidity language site for Ethereum smart contracts.
Frameworks · Frontend
Declarative UI library with fine-grained reactivity and no VDOM.
Frameworks · Backend
The Java ecosystem for building production-grade applications.
Frameworks · Backend
Opinionated Spring setup for standalone production-ready apps.
ORMs · Backend
The Python SQL toolkit and ORM standard.
Penetration Testing · Security
Open-source penetration testing tool that automates SQL injection detection and exploitation.
Compression & Optimization · Image & Media
Google's browser image compressor with advanced codecs (WebP, AVIF).
Agent & LLM Frameworks · AI for Developers
The classic browser UI for Stable Diffusion image generation.
Markdown · PDF & Documents
Browser Markdown editor with Google Drive and GitHub sync.
Terminals & Shells · Development Environment
Fast, customizable shell prompt written in Rust, works with any shell.
Build & Lint · Frontend
Industry-standard workshop for building, testing and documenting UI components.
Headless CMS · Backend
The most popular open-source headless CMS, self-hostable.
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.
NoSQL · Database
Multi-model database with records, graphs and documents (trending).
Frameworks · Frontend
Compiler-based UI framework with no virtual DOM and great DX.
Compression & Optimization · Image & Media
Browser GUI for SVGO, optimizing SVG files with previews.
API Documentation · API Tools
OpenAPI tooling suite by SmartBear: UI, editor, codegen and more.
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.
State & Forms · Frontend
React Hooks for data fetching with caching and revalidation.
Frameworks · Backend
Mature PHP framework and set of reusable components.
References · Documentation & Learning
The most-starred system design study guide — scalable architectures, trade-offs and exercises, free and open source.
AI Coding Assistants · AI for Developers
Self-hosted AI coding assistant — code completion on your own hardware with your own models, no data leaves.