[Qwertie]

Do you know of any of those cross plaform GUI tools that work in the web browser? Targeting Windows/Mac/Linux is easy but outside of JS I have seen no way that you can write one application that works on Web, Windows/Mac/Linux, Android and iOS

[yellowapple]

I know Qt supports both Android and iOS (and a bunch of other mobile platforms, apparently, like Tizen and Blackberry).

I don't think any of them target HTML/JS, though.