Weld - Create websites with any design, for any device, for free, including domain.
Invision - Prototyping and collaboration for design teams
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Frame.io - Video Post Production Collaboration Software
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.