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Invision - Prototyping and collaboration for design teams
Anima App - Design, get feedback, convert to code, publish, iterate.
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.
Sketch Repo - Collection of resources for anyone who uses Sketch
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.