Sea.js
A Module Loader for the Web
Montage
Core framework: Montage simplifies the development of rich HTML5 applications by providing modular components, real-time two-way data binding, CommonJS dependency management, and many more conveniences. Join us on irc.freenode.net#montage or https://groups.google.com/d/forum/montagejs
Chaplin
An Application Architecture Using Backbone.js
Muuri
Responsive, sortable, filterable and draggable grid layouts
Imagesloaded
JavaScript is all like "You images done yet or what?"
Paperclip.js
reactive DOM template engine built for speed, and extensibility
Onfire.js
onfire.js is a simple events dispatcher subscribe / publish library (< 1kb). async, simple and usefull.
Almond
A minimal AMD API implementation for use after optimized builds
Cram
Simple AMD and CommonJS module bundler.
Xsm
State Management made eXtraordinarily simple and effective for Angular, React, and Vue
Winjs
WinJS project by Microsoft Open Technologies
Vis
Dynamic, browser-based visualization library
Overmind
Overmind - Frictionless state management
Mustache.js
Minimal templating with {{mustaches}} in JavaScript
Backbone Layout Manager
A layout and template manager for Backbone.js applications.
Mobservable
Observable data. Reactive functions. Simple code.
Sift.js
filter arrays using mongodb queries