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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.
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.
Icons8 Lunacy - Free graphic design software with built-in resources. Fully compatible with Sketch and works offline
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
MontageJS - MontageJS framework is a platform to develop and create single page applications (which load single HTML page and dynamically update the app as the user puts in inputs or requests or interacts with the page.) with ease.