Justinmind - Define awesome experiences through wireframes & prototypes.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
avocode - Centralize design collaboration, version control, prototyping, feedback, and developer hand-off with Avocode. Work on any design, anywhere, with anyone. Sign up free 👉 https://avocode.com/.
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.