At our research chair (https://mnm-team.org) we used QuIDE (https://quide.eu) quite a lot to try out quantum circuits and teach quantum computing to our students. As many of us were not using Windows that was kind of annoying, because it was only running on Windows. So one of our students refactored QuIDE for Windows (https://quide.eu) together with us with Avalonia UI (https://avaloniaui.net/) for cross platform... - Source: Hacker News / 8 days ago

You might look into https://avaloniaui.net/. - Source: Hacker News / 16 days ago

Businesses do seem to like AvaloniaUI and Uno. https://avaloniaui.net/ https://platform.uno/. - Source: Hacker News / 21 days 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. - Source: Hacker News / about 1 month ago

Yes, but the portable GUI frameworks by Microsoft themselves are generally not very good, and they tend to be abandoned after a couple of years. Avalonia is developed outside of the Microsoft corporate madness and seems to be slowly becoming the defacto cross-platform framework because it is expected to last a bit longer than a manager's attention span: https://avaloniaui.net/. - Source: Hacker News / 4 months ago

I used to use Dev-C++ back in the day. Last release was in 2015, unsure if it supports XP, but you could always keep going backwards until you find a working one. http://orwelldevcpp.blogspot.com/. Source: over 1 year ago