UX Challenges - Done reading about UX? Start doing it.
iOSGODS! - iOSGODS!
Uxcel - The easiest way to learn UX/UI design
5play.ru - 5play.ru enables you to download highly-rated Apps and Games for Android devices.
uxtoast: Learn UX Design - Become familiar with design laws and learn how to use them.
Altstore - A home for apps that push the boundaries on iOS