Pencil Project Pencil is a standalone app or Firefox extension* that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features. The Pencil... Free Open Source Mac Windows Linux PortableApps.com Electron / Atom Shell ... Firefox Firefox Extensions Prototyping Cliparts Diagrams ... Drawing Firefox Extensions Sketching Wireframing Add a feature 363 Like
Interplay Fast prototyping that combines the power of design systems, production code components and live collaboration. Free Mac Windows Linux Web Online collaboration Prototyping Real time collaboration Team Collaboration Add a feature 1 Like
MockingBot 99% free mobile prototyping tool makes it easy to create clickable mobile app prototypes, and collaborate with your team in real time. Commercial $ $ $ Mac Windows Linux Prototyping Add a feature 0 Like
