Koba, the bridge between Knockout and Backbone.
Two-way data-binding with Knockout for Backbone
Automatic view updates on data change
Automatic models and collections updates on view change
Compatible with Backbone models and collections (and nested models and collections)
Free and open source MIT license
Small (5kb minified)
Koba has the following dependencies:
Knouckout (>= 3.1.0)
Backbone (>= 1.1.0)
Underscore.js (>= 1.5.0)