ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Derby.js - MVC framework making it easy to write realtime, collaborative applications that run in both Node.
Chart.js - Easy, object oriented client side graphs for designers and developers.
Ruby on Rails - Ruby on Rails is an open source full-stack web application framework for the Ruby programming...
Backbone.js - Give your JS App some Backbone with Models, Views, Collections, and Events
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.