Underscore.js Backbone.js
Underscore is a JavaScript library that provides a whole mess of useful functional programming helpers without extending any built-in objects. It’s the answer to the question: “If I sit down in front of a blank HTML page, and want to start being productive immediately, what do I need?” … and the tie to go along with jQuery 's tux and Backbone 's suspenders. http://underscorejs.org/ Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, views with declarative event handling, and connects it all to your existing API over a RESTful JSON interface. http://backbonejs.org http://www.quora.com/What-JavaScript-framework-does-Flow-use-for-its-web-frontend - jQuery for DOM manipulation - Underscore.js for awesome, rock solid, and progressive utility - A heavily modified Backbone.js for the model...