Mobbin - Latest mobile design patterns & elements library
Maze - Beautiful & actionable analytics for InVision prototypes
Pablito Planeta - Monthly designer horoscopes by Pablo Stanley
ProtoPie - ProtoPie is the easiest tool used to turn your UI/UX design ideas into highly interactive prototypes for mobile, desktop, web, all the way to IoT.
Monochrome - Monochrome is a modern browser that brings mobile web apps to desktop.
Dimensions Toolkit - Chrome Extension for designers to test responsive websites.