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The entire runtime stack is open source.

https://github.com/dotnet/corefx https://github.com/dotnet/coreclr

Right. Core. No Windows forms, so the only app I ever wrote for it will not work yet.

Windows Forms is only a subset of the framework. I don't think exposing Windows Forms as an open source GUI stack would be worth while. It's old and clunky compared to WPF and XAML.

Even without a open source GUI stack the open source .Net Runtime and Framework provide value to .Net developers like myself who enjoy C# (and the F# lovers too!) to develop on Linux, FreeBSD, and OS X with much less pain than in the past. Not fitting each and every scenario doesn't diminish its significance.

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