Ajax.org Cloud9 Editor
brainfuck on JS
Emoticon interpreter in CoffeeScript
CPython compiled to JS using emscripten
A bot that speaks code
Creates an express router augmented with promise handling routes
Feature complete web terminal
An implementation of the Smalltalk language that runs on top of the JS runtime
A LOLCode compiler+VM in CoffeeScript
A gem for turning URLs into website previews
https://repl.it/feedback Online REPL for 15+ languages.
An Unlambda interpreter in CoffeeScript
browserify as a service.