Coding with Chrome (extension for Chrome)

Learn, improve, or teach coding skills within a Chrome browser.
Coding with Chrome is a Google project to provide 
an easy-to-use coding/programming environment (IDE) 
within the Chrome browser that even works offline. 
Currently, users are able to create programs using 
Blockly, Coffeescript, HTML, Javascript and Python 
with output to Logo Turtle and/or connected toys 
such as the Sphero, mBot and Lego Mindstorms.