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UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
React Proto - React application design and prototyping tool
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Userflows - Automatically generate user journeys
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project