Free
Comprehensive regex tutorial and reference for all flavors.
regexreferencetutorial
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Comprehensive regex tutorial and reference for all flavors.
Frameworks · Frontend
Web-standard React framework merged into React Router v7.
Icons · Frontend
Open-source neutral-style system icon set with 3,000+ glyphs in outlined and filled styles.
Smart Contracts · Web3 & Blockchain
Browser IDE for Solidity — write, compile, deploy and debug contracts with zero local setup.
References · Documentation & Learning
Official repository of Internet RFC specifications.
Web Analytics · Monitoring & Observability
Google's validator for structured data — check JSON-LD eligibility for snippets, breadcrumbs and products.
CLI Tools · Development Environment
Extremely fast, recursive line-oriented regex search tool (rg).
Courses & Tutorials · Documentation & Learning
Community-driven developer roadmaps, guides and skill assessments.
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.
Package Managers · Development Environment
Command-line installer for Windows focused on developer tools.
Web Scraping · Data & Analytics
Python's industrial-strength crawling framework — spiders, middlewares, throttling and pipelines built in.
Headers & CSP · Security
Scan any site's HTTP security response headers and get a grade.
E2E & Browser · Testing
The long-standing browser automation suite with broad language support.
Cheatsheets & Learning · Git & Version Control
The SemVer specification for meaningful version numbers.
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.