Obviously webapps are a thing apart because browsers only support JS. But otherwise... C++. .Net-based languages. JVM-based languages. (although I am not aware

Obviously webapps are a thing apart because browsers only support JS. But otherwise... C++. .Net-based languages. JVM-based languages. (although I am not aware of any tool that works on iOS) Hell, in most of the platforms you can use your language of choice and P/Invoke C++ components.