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FluentAvalonia
Control library focused on fluent design and bringing more WinUI controls into Avalonia
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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.
Looks like someone had the same question and made their own navigation view. Here is a link to their Github repository.
It's literally not the most basic control for Windows development. That would be something like Window, Button, or TextBlock. If you're only using the basic features of a NavigationView, then you can implement it using a simple ListBox with some minor styling instead. The fully featured NavigationView from UWP has a lot of complexity that most devs won't need. You could also use the implementation from FluentAvalonia