TortoiseSVN - The coolest interface to (Sub)version control
Invision - Prototyping and collaboration for design teams
SnailSVN - Similar to Tortoise SVN for Windows but integrated into Finder
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Xversion - Super easy enterprise class version control.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.