http://locomotivejs.org/ - is a heavily Rails-inspired framework with an API that remains idiomatic Node. It's being used in my applications, and a number of other developers have adopted it as well. The current feature set is reliable, and completely covered by unit tests. Ease of use is sufficient (especially if you have a Rails background), and is constantly improving. I'm not going to make any proclamations about maturity, because I think both it and the Node ecosystem are evolving too rapidly at this point.

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