freeCodeCamp.org's open-source codebase and curriculum. Learn math, programming, and computer science for free.

Interactive roadmaps, guides and other educational content to help developers grow in their careers.

VS Code in the browser

Joplin - the privacy-focused note taking app with sync capabilities for Windows, macOS, Linux, Android and iOS.

A terminal built on web technologies

Nodejs extension host for vim & neovim, load extensions like VSCode and host language servers.

Lightweight, user-friendly onboarding tour library

A terminal emulator for the 21st century.

Run compilers interactively from your web browser and interact with the assembly

Save. Share. Privately.

Play with neural networks!

Browser-based frontend to gdb (gnu debugger). Add breakpoints, view the stack, visualize data structures, and more in C, C++, Go, Rust, and Fortran. Run gdbgui from the terminal and a new tab will …

Better tools for thought

Deploy your own Notion-powered website in minutes with Next.js and Vercel.

WebChatGPT: A browser extension that augments your ChatGPT prompts with web results.

🔬 A fast, interactive web-based viewer for performance profiles.

Pokémon battle simulator.

Run code interactively, inspect data, and plot. All the power of Jupyter kernels, inside your favorite text editor.

An Electron DevTools Extension

GitHub star history and stats - based on JavaScript only!

A port of Coq to Javascript -- Run Coq in your Browser

Coq Support for Visual Studio Code