all, I'm thinking of porting my application from VB.net to the C# based MONO project, so it can run on both Windows and Mac. However, I am in need of a Mac-friendly alternative to WPF. It has to have very similar functionality. QML (by QT) is not a viable option, as it costs far too much money for us.
There is also https://github.com/AvaloniaUI/Avalonia a multi-platform .NET UI framework inspired by WPF