Free
LangGraph
Open SourceAgent & LLM Frameworks · AI for Developers
Build stateful, multi-agent AI applications as graphs.
aiagentsgraphspython
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Agent & LLM Frameworks · AI for Developers
Build stateful, multi-agent AI applications as graphs.
Inspiration & Galleries · Design & Prototyping
Jon Yablonski's collection of UX maxims (Hick's Law, Fitts's Law…) with citations and practical takeaways.
Generators · CSS Tools
Interactive CSS Grid layout builder with code export.
Clients & GUIs · Git & Version Control
Simple, powerful terminal UI for Git commands.
Cheatsheets & Learning · Git & Version Control
Interactive visualization game for learning Git branching.
SSL & TLS · Security
Diagnose why Let's Encrypt certificate issuance fails for a domain.
Load & Performance · Testing
Google's automated audits for performance, SEO, a11y and best practices.
Internationalization · Frontend
Developer-friendly i18n for React and Node — readable message catalogs, macros and automatic extraction.
Models & LLM APIs · AI for Developers
Open-source LLM gateway: one API for 100+ providers.
Models & LLM APIs · AI for Developers
Meta's open-weight LLM family with downloadable weights.
Models & LLM APIs · AI for Developers
The C/C++ inference engine that runs LLMs everywhere, even laptops.
Load & Performance · Testing
Scalable user load testing written in Python.
Programming Languages
Official Lua website with reference manual and source.
Icons · Frontend
Beautiful, consistent open-source icon library with framework packages.
Mobile Backend & Services · Mobile Development
Simple YAML-driven UI testing for iOS and Android (trending).
Email · API Tools
Self-hosted email testing tool with a web UI, catches local mail.
CLI Tools · Development Environment
The classic build automation and task runner present everywhere.
UI Libraries · Frontend
Full-featured React components with hooks and theming out of the box.
Relational · Database
Community-developed MySQL fork with a permissive license.
Markdown · PDF & Documents
Free reference and tutorial for Markdown syntax.
Design Systems · Design & Prototyping
Google's open-source design system with guidelines and tokens.
MCP · AI for Developers
The open standard connecting AI models to tools and data sources.
Documentation Generators · PDF & Documents
Create books and docs from Markdown, made by the Rust community.
References · Documentation & Learning
The definitive reference for HTML, CSS and JavaScript, by Mozilla.