Nifty - Manage projects, work, and communications in one place.

SketchCasts - A weekly screencast, all about how to use Sketch

Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

GoRails - Ruby on Rails screencasts for Web Developers

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

Sketch Talk - A community for Sketch users of all skill levels