Backbone.js is minimalist mvc framework for JavaScript, written by Jeremy ashkenas, the author of coffee script. Backbone is a good choice for creating larger couch apps, as an alternative to evently. A robust backbone-couchdb connector that supports realtime updates via the _changes feed is supported by Jan Monschke.
See this introduction to couch apps with backbone by Jan.
Extended version of Backbone.js couch connector (with fixing some issues, extending functionality) is available here:
https://github.com/andrzejsliwa/backbone-couch
And example use case: