Skafos actually leverages CoreML and the models do run on device. It's a live update to device local models in the background, or even hot swap while in the foreground.
It supports any field type you want, SurveyField has a property of fieldClass, so you can set it to [UITextView class] and it will do it's best to use it
It's not a UINavigationController replacement. It's a slide menu like facebook, just uses nav controller as inspiration, to make creating slide menus, that are all the rage, easier to setup use and dictate what goes on your navigation list. I will work on a better screen shot, but there isn't much for a screen shot to show. It also uses iOS containment as well.
Friend and I are currently working on an embeddable library for server-side javascript called CoreJS (http://github.com/frenzylabs/CoreJS). It's not to compete with node, as it's meant to be embedded. It's threadsafe, and is, optionally, async.