There is matador. It is MVC and it consists of many different existing components, such as Klass for inheritance model, express, hogan.js, and valentine. Backbone.js is pretty much used for client side. For node, i think there's probably only matador that I know.
I'd suggest you against using it if you're to use matador for production or replace your existing MVC platform (or at least have a bottleneck/good reason to use it) since it's pretty new, and your productivity also depends on the javascript resources you have. We ourselves use node.js very extensively (our node.js deployment serves close to +4 Million users to date) and we have a significant number of javascript specialists here..so we experiment a lot and probably look into using matador soon. Hope that helps.
