UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Smartmockups - Create stunning product mockups, easily and online.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
MockMagic - A free, easy-to-use device mockup generator