"Catel is an application development platform with the focus on MVVM (WPF, UWP, Xamarin.Android, Xamarin.iOS and Xamarin.Forms). The goal of Catel is to provide a complete set of modular functionality for Line of Business applications written in any .NET technology, from client to server." according to Geert van Horrik.
An older article about the first Catel version can be found on CodeProject.
SpecsUpdate
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Pros
Pro Business oriented
Complete set of modular functionality for Line of Business applications written in any .NET technology, from client to server.
Pro Well documented
Cons
Con Missing examples
At the bottom of the GitHub page it still says:
// todo: add wpf
// todo: add uwp
Con Mostly a single person project
As can be seen in the GitHub Issues, most issues are handled by a single person. Most issues are solved which is quite impressive, but this situation is not ideal for the future of an open-source project.