Free
HeroUI
Open SourceUI Libraries · Frontend
Beautiful Tailwind + React components (formerly NextUI).
reacttailwindcomponents
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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.
Internationalization · Frontend
The de-facto JavaScript i18n framework — namespaces, plurals, interpolation and plugins for every framework.
Icons · Frontend
Unified framework for using 200,000+ icons from many icon sets.
Conversion · Image & Media
Classic CLI suite for creating, editing and converting images.
NoSQL · Database
Purpose-built time-series database for metrics and events.
Design Tools · Design & Prototyping
Free, open-source professional vector graphics editor.
API Clients · API Tools
Open-source API client for REST, GraphQL and gRPC by Kong.
Cross-Platform · Mobile Development
Cross-platform SDK using web technologies for hybrid apps.
Orchestration · DevOps
The leading service mesh for traffic, security and observability.
APM & Tracing · Monitoring & Observability
Open-source distributed tracing platform, CNCF graduated.
Models & LLM APIs · AI for Developers
Open-source ChatGPT alternative that runs LLMs fully offline on your machine, with an OpenAI-compatible API.
References · Documentation & Learning
The Modern JavaScript Tutorial — the deepest free JS reference from basics to advanced browser APIs.
CI/CD · DevOps
The classic open-source automation server for CI/CD.
Unit & Component · Testing
Delightful JavaScript testing framework with snapshots and mocks.
CLI Tools · Development Environment
Lightweight command-line JSON processor.
Programming Languages
High-performance language for technical and scientific computing.
Unit & Component · Testing
The standard testing framework for the JVM: annotation-driven unit tests for Java and Kotlin.
Notebooks & Data Science · Data & Analytics
The standard interactive notebooks for data science and ML.
Load & Performance · Testing
Open-source load testing tool using JavaScript test scripts.