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Avalonia
Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The most popular .NET UI client technology
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
The GTK library might not be a terrible choice if you end up targeting Linux. It's fast to prototype with (in my experience) and very well-optimized for touch/tablet interfaces. Well worth checking out IMO: https://www.gtk.org/
You might also want to look at AvaloniaUI[0] for a cross platform .NET GUI library. It is similar to WPF but much nicer to work with.
[0] https://github.com/AvaloniaUI/Avalonia
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.