Free
Go
Open SourceProgramming Languages
Official Go language website with docs, packages and playground.
gogolanglanguagedocumentation
Browse the complete directory — use filters to narrow down.
Programming Languages
Official Go language website with docs, packages and playground.
Game Engines · Game Development
Free, open-source, community-driven game engine with GDScript and a lightweight, hackable editor.
Web Analytics · Monitoring & Observability
Google's free webmaster console — indexing status, search queries, sitemaps and Core Web Vitals data.
AI Coding Assistants · AI for Developers
Block's open-source extensible AI coding agent for the terminal.
ORMs · Backend
The fantastic ORM library for Go.
API Protocols · Backend
Query language and runtime for APIs, with a rich ecosystem.
Pipelines & ETL · Data & Analytics
The data quality standard — declare expectations about your data, validate pipelines and generate data docs.
API Protocols · Backend
High-performance, open-source RPC framework over HTTP/2 with protobuf.
Animation · Frontend
Robust JavaScript animation library, now free for everyone.
Compression & Optimization · Image & Media
Open-source video transcoder with presets for every device.
Smart Contracts · Web3 & Blockchain
The Ethereum development environment — compile, test, debug and deploy smart contracts with a rich plugin ecosystem.
Passwords & IDs · Security
Manage secrets, certificates and encryption centrally.
Programming Languages
Official site for the purely functional programming language.
ORMs · Backend
Instant GraphQL APIs over your databases with permissions built in.
UI Libraries · Frontend
Unstyled, accessible React and Vue primitives (dialogs, menus, comboboxes) from the Tailwind team.
Agent & LLM Frameworks · AI for Developers
Open-source LLM observability — logging, caching, rate limiting and cost tracking behind a one-line proxy.
Orchestration · DevOps
The package manager for Kubernetes applications.
UI Libraries · Frontend
Beautiful Tailwind + React components (formerly NextUI).
Package Managers · Development Environment
The missing package manager for macOS and Linux.
Frameworks · Backend
Ultrafast web framework that runs on any JS runtime and edge.
API Clients · API Tools
Lightweight, open-source API development ecosystem in the browser.
Frameworks · Frontend
Access modern browser features directly from HTML, no JS build needed.
API Clients · API Tools
User-friendly HTTP client for the CLI with JSON-first syntax.
Models & LLM APIs · AI for Developers
The AI community hub: models, datasets, spaces and libraries.