Invision - Prototyping and collaboration for design teams
Pixelapse - Visual version control and collaboration workflow for open source and private design projects.
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
pttrns - iPhone and iPad user interface patterns
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
UI Patterns - Level up with interactive mobile design patterns