Draw to Drive - Social network for car artist, designers and car art lovers.
Flowkit - Sketch library for user flows/content maps/annotations
Pixel Perfect Handbook - A comprehensive handbook on digital design
Crystal: Sketch Mirror for Android - Crystal: Sketch Mirror for Android is an application that is designed for viewing your sketch designs in real-time, navigate prototypes and download content related to the sketches for offline viewing.
Concepts - Concepts is a digital design sketchbook for iPhone, iPad, iPad Pro and windows 10 devices.
Figma Mirror - Figma Mirror is an application that covers top trending designing or sketching ideas making your teamwork in a single environment and design better products from start to finish.