jquip : Smaller, Lighter, Faster, more modular jQuery - include only the parts you want! Don't use it, Don't include it.
Leaflet : A Modern, Lightweight Open-Source JavaScript Library for Interactive Maps
Ember.js : A JavaScript framework for creating ambitious web applications
cssQuery() : cssQuery() is a powerful cross-browser JavaScript function that enables querying of a DOM document using CSS selectors. All CSS1 and CSS2 selectors ar...
Protovis : Protovis composes custom views of data with simple marks such as bars and dots. Unlike low-level graphics libraries that quickly become tedious for vi...
Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.