GUI Framework recommendation

[aizen92]

Hello, I want to develop some GUI, can anybody recommend a good, easy-to-use GUI Framework. I want to use it to develop linux GUI apps first, then if everything went okay, I'll write for windows too.
Thanks for the help

[Moschops]

QT is a popular choice for cross-platform.

[coder777]

http://wxwidgets.org/

[mik2718]

This is much simpler and lighter than those monsters

http://www.fltk.org/