Microsoft open-sourced WPF, along with Windows Forms and the Windows UI XAML Library (WinUI), in December 2018 on GitHub. It open-sourced WPF after discouraging developers from porting WPF apps to ...

though a little searching will find the initial tranche of documentation on GitHub. Like the rest of the Windows Community Toolkit, the MVVM Toolkit installs from a Nuget repository. As it was ...