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Invision - Prototyping and collaboration for design teams
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
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.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Pencil - Pencil is an animation/drawing software for Mac OS X, Windows, and Linux.
Proto.io - Create fully-interactive high-fidelity prototypes in minutes that look and work exactly like your app should. Sign up for a free 15-day trial and get started.