Iframer Tab management
Plannr Evernote meets twitter
Bitrhythm Live coding in the style music trackers for the web using tone.js
Virtuator A 2D / 3D animation tool with babylon.js for making youtube videos with text
Wheel Modern literate programming with cog, python, jinja and sphinx
Loom Animate your code on the terminal
Raptor What if C had python for a preprocessor ?