[grabcocque]

If you want to develop cross platform mobile apps your only other option seems to be React Native. I'd like to see a good rundown of the pros and cons of each approach.

[distances]

There are tons of cross-platform mobile application frameworks ranging from Qt to Unity, Marmalade to probably hundreds of web-based solutions.

What Xamarin and React Native have in common is (partly) using native UI layers for building the interfaces, perhaps you wanted to specifically address frameworks doing that?

[omnibrain]

There also is Delphi with the mobile Addon. https://www.embarcadero.com/products/delphi

[Swinx43]

I learned Pascal in school many years ago. I honestly did not know that Delphi was still kicking around. Very interesting to see this :)