Flinto lets designers quickly make interactive prototypes of their mobile, desktop, or web apps. Email hello@flinto.com for support.

Collection of free PSDs, Sketch files, free Fonts and other resources for designers, updated every day on DesignerMill.

Principle makes it easy to design animated and interactive user interfaces. Whether you're designing the flow of a multi-screen app, or new interactions and animations, Principle helps you create designs that look and feel amazing.

Color Hunt is a free and open platform for color inspiration with thousands of trendy hand-picked color palettes