GTK/Gnome style UIs have supported C# for decades at this point. Including some programs that were shipped by most mainstream Distros https://en.wikipedia.org/w

GTK/Gnome style UIs have supported C# for decades at this point. Including some programs that were shipped by most mainstream Distros https://en.wikipedia.org/wiki/Tomboy_(software) https://en.wikipedia.org/wiki/Tomboy_(software) (not without controversy; but technically they worked well)