UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Fuse - Fuse is a UX tool suite for mobile app designers and developers.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
GoodBarber - GoodBarber is a mobile app creation platform.
Axure RP - The prototyping and specification software used by 87% of the Fortune 100. Beyond mockups, design interactive prototypes for business solutions, websites, and applications.
Dropsource - Mobile development platform for building native iOS & Android apps