Free
Selenium
Open SourceE2E & Browser · Testing
The long-standing browser automation suite with broad language support.
e2ebrowserautomation
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E2E & Browser · Testing
The long-standing browser automation suite with broad language support.
Dependency Security · Security
Fast static analysis for finding bugs and vulnerabilities in code.
ORMs · Backend
Promise-based Node.js ORM for Postgres, MySQL, MariaDB and SQLite.
UI Libraries · Frontend
The shadcn/ui philosophy ported to Svelte: copy-paste components you own, built on Melt UI.
UI Libraries · Frontend
Copy-and-paste React components built on Radix and Tailwind.
Screenshots · Image & Media
Powerful open-source screenshot and screen recording tool for Windows.
Hosting & Collaboration · Git & Version Control
The badge service for READMEs — build status, version, downloads and custom badges as compact SVGs.
Queues & Streaming · Database
Ruby's most popular background job processor — simple, efficient and backed by Redis.
APM & Tracing · Monitoring & Observability
Open-source Datadog alternative built on OpenTelemetry.
Icons · Frontend
Free SVG brand icons for popular products and companies.
UI Libraries · Frontend
Adaptive design system for Svelte and React on Tailwind, with themes and accessible components.
API Testing · API Tools
API testing tool specialized in SOAP and REST services.
API Protocols · Backend
Reliable bidirectional realtime communication over WebSockets.
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.
SQL Tools
Popular open-source JavaScript library to format SQL in your apps.
ORMs · Backend
The Python SQL toolkit and ORM standard.
Relational · Database
Self-contained, serverless, embedded SQL database engine.
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.