Base UI Sketch Framework - Huge set of everything you need to design and prototype
iOSGODS! - iOSGODS!
SketchCasts - A weekly screencast, all about how to use Sketch
5play.ru - 5play.ru enables you to download highly-rated Apps and Games for Android devices.
UiSketcher - Easily sketch user interface with your pen-enabled device!
Altstore - A home for apps that push the boundaries on iOS