Invision - Prototyping and collaboration for design teams
Zeplin - Collaboration app for UI designers & frontend developers
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
ActiveWords - Auto correct on steroids