[justryry]

The larger problem on cross-platform KeePass was never Mono directly (aside from the FUD), but rather the WinForms UI. One could blame Mono for not having a visually pleasing implementation of WinForms, although .NET core has nothing at all.

Refactoring out a core and building multiple UIs would be an interesting and large project.

[YaraGreyjoy]

It doesn't necessarily have to be multiple UIs (although that's probably better in the long term) but there are x-platform options like:

1) Eto.Forms (https://github.com/picoe/Eto) 2) Avalonia (https://github.com/AvaloniaUI/Avalonia)