Balsamiq

MockFlow provides a very intuitive and powerful editor for brainstorming UI in the quickest time. MockFlow includes a sophisticated revision history system to keep track of your various UI iterations easily. Provide annotated feedback for having contextual discussions on any UI area. Also collaborate on UI designs with your entire team face-to-face and conduct remote UI presentations for design meetings and walkthroughs using the built-in communication suite

Where teams design together. Figma helps teams create, test, and ship better designs from start to finish. Fast and powerful, just like your work. Packed with design features you already love plus unique inventions like the Arc tool and Vector Networks, Figma helps you keep the ideas flowing. No need to stop to install, save, or export. It’s what any good cloud software should be. Bring your ideas to life faster in animated prototypes that feel like the real thing. Get insights from users and test concepts earlier and more often. Share a link to your design files or prototypes, and get feedback in context. Or, jump into the same file with your teammates—no matter where y’all are in the world—and co-edit live. Create a scalable design system that’s accessible for your organization and easy for you to manage. When all designers are speaking the same language, everyone’s more empowered to do their best work.