A.I. Experiments by Google - Explore machine learning by playing w/ pics, music, and more
Sketch Talk - A community for Sketch users of all skill levels
Swift Playgrounds - Learn serious code on your iPad in a seriously fun way
SketchCasts - A weekly screencast, all about how to use Sketch
Talk to Books by Google - Browse passages from books using experimental AI
Sketch 101 by Designlab - Learn Sketch in this free course w/ downloadable templates