Re: .NET WinForms -- they open sourced it a few years back. https://github.com/dotnet/winforms https://github.com/dotnet/winforms They even went so far as to

Re: .NET WinForms -- they open sourced it a few years back. https://github.com/dotnet/winforms https://github.com/dotnet/winforms They even went so far as to bring back the forms designer to Visual Studio. https://devblogs.microsoft.com/dotnet/windows-forms-designer-for-net-core-released/ https://devblogs.microsoft.com/dotnet/windows-forms-designer... Obviously it's still a pretty sizable migration to go from .NET Framework to .NET, but at least the UI framework is available again.