Ink
An HTML5/CSS3 framework used at SAPO for fast and efficient website design and prototyping
Sea.js
A Module Loader for the Web
Qooxdoo
A Universal JavaScript Framework
When
A solid, fast Promises/A+ and when() implementation, plus other async goodies.
Lazy.js
Like underscore.js, but lazier
Min Pub Sub
198 byte publish/subscribe messaging micro-framework
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
Scale App
scaleApp is a JavaScript framework for scalable One-Page-Applications
Derby
MVC framework making it easy to write realtime, collaborative applications that run in both Node.js and browsers
Grips
Simple-logic templates
Maria
The MVC framework for JavaScript applications. The real MVC. The Smalltalk MVC. The Gang of Four MVC.
Rx Js
The Reactive Extensions for JavaScript
Lmd
LMD: Lazy Module Declaration. Be lazy: lazy load @ lazy init
Mask Js
Zen Coding | Markup | Template | HMVC
jTypes
jTypes is the most comprehensive and robust JavaScript library for overcoming differential inheritance with prototype-based objects. Its lightweight yet powerful design provides web programmers on any platform or browser the ability to emulate classical inheritance where objects are defined by classes.
Rest
RESTful HTTP client for JavaScript
Meld
AOP for JS with before, around, on, afterReturning, afterThrowing, after advice, and pointcuts