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Invision - Prototyping and collaboration for design teams
Anima App - Design, get feedback, convert to code, publish, iterate.
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Sketch Repo - Collection of resources for anyone who uses Sketch
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Git Sketch Plugin - Version control for designers