Free
Remix IDE
Open SourceSmart Contracts · Web3 & Blockchain
Browser IDE for Solidity — write, compile, deploy and debug contracts with zero local setup.
solidityideethereumweb
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Smart Contracts · Web3 & Blockchain
Browser IDE for Solidity — write, compile, deploy and debug contracts with zero local setup.
Build & Lint · Frontend
Module bundler optimized for libraries and tree-shaking.
AI Coding Assistants · AI for Developers
Community-driven AI dev agent for VS Code with multiple modes.
Build & Lint · Frontend
Fast Rust-based webpack-compatible bundler.
Programming Languages
Official Ruby language website with documentation and news.
Frameworks · Backend
Full-stack Ruby framework following convention over configuration.
CLI Tools · Development Environment
An extremely fast Python linter and formatter, written in Rust.
Programming Languages
Official Rust website: documentation, book, crates and tooling.
Ecosystem · CSS Tools
The mature CSS extension language with variables and nesting.
Programming Languages
Official Scala language site with documentation and downloads.
API Documentation · API Tools
Beautiful OpenAPI docs and modern API client, open source.
Web Scraping · Data & Analytics
Python's industrial-strength crawling framework — spiders, middlewares, throttling and pipelines built in.
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.
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.