Free
gluestack-ui
Open SourceMobile UI Libraries · Mobile Development
Copy-paste React and React Native components — universal, themeable and built on a styled system.
react-nativecomponentscross-platform
Browse the complete directory — use filters to narrow down.
Mobile UI Libraries · Mobile Development
Copy-paste React and React Native components — universal, themeable and built on a styled system.
Programming Languages
Official Go language website with docs, packages and playground.
Inspiration & Galleries · Design & Prototyping
A curated gallery of astonishing websites — a tight, high-quality alternative to endless scroll.
Game Engines · Game Development
Free, open-source, community-driven game engine with GDScript and a lightweight, hackable editor.
Models & LLM APIs · AI for Developers
Browser IDE for prototyping with Gemini models and API keys.
Hyperscalers · Cloud Platforms
Google Cloud Platform: compute, data, AI and serverless.
Notebooks & Data Science · Data & Analytics
Free cloud Jupyter notebooks with GPU/TPU access.
Typography & Fonts · Design & Prototyping
The free web font library — 1,800+ open-source families with variable fonts and easy embed.
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.
Learning & Reference · CSS Tools
Learn CSS Grid by watering carrots in an interactive game.
Models & LLM APIs · AI for Developers
Ultra-fast LLM inference on custom LPU hardware.
API Protocols · Backend
High-performance, open-source RPC framework over HTTP/2 with protobuf.
Animation · Frontend
Robust JavaScript animation library, now free for everyone.
Passwords & IDs · Security
Online GUID/UUID generator with many formatting options.
Penetration Testing · Security
Crowdsourced penetration testing labs and CTF challenges for practicing offensive security skills.
Communities · Documentation & Learning
Y Combinator's tech news and discussion community.
Practice & Challenges · Documentation & Learning
Coding challenges and technical interview practice platform.
Compression & Optimization · Image & Media
Open-source video transcoder with presets for every device.
Color Tools
Curated palettes shown in context on a real website.
Smart Contracts · Web3 & Blockchain
The Ethereum development environment — compile, test, debug and deploy smart contracts with a rich plugin ecosystem.