The best free developer resource center — discover tools, frameworks, component libraries, databases, deployment platforms, AI coding assistants, icons and more, curated in one place. Not a bookmark list — a developer ecosystem.
A live HTML/CSS/JS editor, a Tailwind playground, CSS generators for Flexbox, Grid, shadows and glassmorphism, plus a sitemap builder — all interactive, all free.
A beginner-friendly reference site with short tutorials and interactive try-it-yourself editors for HTML, CSS, JavaScript, and more.
Community-built visual roadmaps that lay out the skills and steps to learn different developer roles and technologies.
A structured, project-based curriculum for learning full-stack web development, curating free resources and exercises into a guided path.
A self-paced curriculum of coding lessons and certifications covering web development, data structures, and more, with hands-on coding challenges.
A comprehensive reference and guide for HTML, CSS, and JavaScript maintained collaboratively, widely used as the canonical web platform documentation.
An open-source AI coding agent that runs inside VS Code, able to edit files, run terminal commands and use the browser to complete tasks.
An autonomous AI software engineer from Cognition that can plan, write, test and iterate on multi-step coding tasks with less hand-holding.
An AI coding assistant that uses codebase-wide context to answer questions, write code and explain unfamiliar parts of a large repository.
A statically typed superset of JavaScript from Microsoft that compiles to plain JS, catching type errors before runtime.
A React framework from Vercel that adds server rendering, routing, and full-stack conventions on top of React.
A framework that shifts work to compile time, producing highly optimized vanilla JavaScript instead of shipping a runtime library.
A content-focused web framework built around shipping minimal JavaScript by default, with an islands architecture for interactivity.
A fast frontend build tool that uses native ES modules for near-instant dev server startup and hot module replacement.
A collection of copy-in, Radix-based React components styled with Tailwind CSS that you own and customize directly in your codebase.
The markup language that defines the structure and content of every web page, standardized under the WHATWG living standard.
The stylesheet language used to control layout, color, and visual presentation across web pages and applications.
The dynamic scripting language that powers interactivity in browsers and, via runtimes like Node.js, on servers as well.
A statically typed superset of JavaScript from Microsoft that compiles to plain JS, catching type errors before runtime.
A component-based JavaScript library from Meta for building user interfaces out of reusable, composable pieces.
A React framework from Vercel that adds server rendering, routing, and full-stack conventions on top of React.
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Beautify, minify and validate JSON with clear error messages — built into TechToolsCenter.
Encode or decode Base64 text and files instantly in your browser.
Decode a JSON Web Token's header and payload to inspect its claims.
Generate MD5, SHA-1, SHA-256 and other hashes from text or files.
Generate v4 UUIDs individually or in bulk for test data and IDs.
Create styled, branded QR codes for URLs, Wi-Fi, vCard, UPI and more.
Scan a QR code with your camera or an uploaded image, right in the browser.
Compress JPG, PNG and WebP images locally, with no upload to a server.
Merge, split, compress, and convert PDFs — a full private, in-browser PDF workspace.
Clean, transform, count and de-duplicate text — a full text-utility workspace.
Convert between Unix timestamps and human-readable dates, across time zones.
Encode or decode URL components and query strings instantly.
Convert colors between HEX, RGB, HSL and more, with a live picker.
Design linear and radial CSS gradients and copy production-ready code.
Generate placeholder paragraphs, sentences or word lists for mockups.
Convert Markdown to HTML or HTML back to Markdown, instantly.
Convert CSV to JSON or JSON back to CSV, with quoted-field support.
The markup language that defines the structure and content of every web page, standardized under the WHATWG living standard.
The stylesheet language used to control layout, color, and visual presentation across web pages and applications.
The dynamic scripting language that powers interactivity in browsers and, via runtimes like Node.js, on servers as well.
A component-based JavaScript library from Meta for building user interfaces out of reusable, composable pieces.
An approachable progressive JavaScript framework for building UIs, known for its gentle learning curve and single-file components.
A utility-first CSS framework that lets developers build custom designs directly in markup without writing separate stylesheets.