Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Sketch - Professional digital design for Mac.
Invision - Prototyping and collaboration for design teams
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
ProtoPie - ProtoPie is the easiest tool used to turn your UI/UX design ideas into highly interactive prototypes for mobile, desktop, web, all the way to IoT.