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