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Review of Udash powered by the Slant community.
Modern scala web framework that compiles Scala to Javascript and allows building the GUI directly in Scala (type safe!) with component library (Bootstrap)
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Pros
Pro High level - focus on what you want to do rather than the plumbing
Similar to Vaadin & Meteor but in Scala.
Pro clean modern design
This framework is much more modern than a lot of its competition (e.g. Spring MVC).
Pro Components similar to desktop GUI framework for high level & fast construction of complex GUIs
Pro do it all in Scala in a type safe way
Cons
Con Very new and hence doesn't have a big community yet
Con Limited documentation, no books or 3rd party tutorials/samples
You'll have to be willing to be a pioneer.