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The C# compiler has an MIT license and is available on GitHub, which is about as FOSS as it gets. https://github.com/dotnet/roslyn https://github.com/dotnet/ro

• crote 2y ago
  The compiler is one thing, the ecosystem is another. Sure, you can compile and host your .NET Core web app on Linux these days, but desktop applications are a completely different beast. You're often lucky if one exists at all, and if it does there's a decent chance it's not designed for "modern" C#-on-Linux. It really isn't a viable option yet, maybe in a decade or two.
  • stanac 2y ago
    WPF is MIT licensed, available on github. The fact that it's windows only doesn't make it less FOSS. Microsoft doesn't have incentive to port it to other platforms but other people and companies are free to do that.
    • MarkSweep 2y ago
      WPF is not the best example of open source, as some components are still closed source. Though it only runs on Windows, a closed source operating system, so perhaps that is not so important. https://github.com/dotnet/wpf/issues/2554 https://github.com/dotnet/wpf/issues/2554 That said, there are cross platform, open source .NET UI frameworks out there, including one that is inspired by WPF: https://avaloniaui.net/ https://avaloniaui.net/