ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Demostack - The no-code product demo experience platform
Chart.js - Easy, object oriented client side graphs for designers and developers.
Screen Guru - Take clean screenshots of any website
Backbone.js - Give your JS App some Backbone with Models, Views, Collections, and Events
Drama - Design, prototype and animate in a single Mac app.