Craftwork - A collection of User Interface resources made by Craftwork
Invision - Prototyping and collaboration for design teams
Chat by Stream - Build and ship in app messaging in a few hours
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Rodman Mobile UI Kit - Premium colorful iOS templates designed for Sketch App
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.