WorkoutSesh - Free workout routines with interval timer
ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
ThinkThinly - Motivational text messages sent at workout times.
Chart.js - Easy, object oriented client side graphs for designers and developers.
Tabata Timer - Tabata Timer is a mobile application that helps you perform high-intensity workouts.
Backbone.js - Give your JS App some Backbone with Models, Views, Collections, and Events