Now, don't get me wrong: I have grave suspicions there is currently only one actual implementation of them (I don't count hobby, or abandonware, ones) but IMHO "actual standard" combined with "for real reference implementation" is way better than just reference implementation
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since I'm still within the edit window, the MAUI referenced by the sibling comment is MIT licensed https://github.com/dotnet/maui
However, above and beyond free, it is also a collection of ECMA standards https://learn.microsoft.com/en-us/dotnet/fundamentals/standa...
Now, don't get me wrong: I have grave suspicions there is currently only one actual implementation of them (I don't count hobby, or abandonware, ones) but IMHO "actual standard" combined with "for real reference implementation" is way better than just reference implementation
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since I'm still within the edit window, the MAUI referenced by the sibling comment is MIT licensed https://github.com/dotnet/maui
https://github.com/dotnet/blazor (Apache 2) is marked an archived, and points to https://github.com/dotnet/aspnetcore (MIT) but command-f blazor on its readme is nothing so :shrug: