Invision - Prototyping and collaboration for design teams
UI Movement - The best UI design inspiration, daily
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
UI Garage - Specific mobile and web design patterns for your inspiration
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
CodeMyUI - Handpicked code snippets you can use in your web projects