Sketch Repo - Collection of resources for anyone who uses Sketch
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Charts by ls.graphics - The most comprehensive collection of charts for 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.
Gmail Add-on Design Kit - A simple Sketch library to speed up Gmail Add-on designs
Tables by Google - Tables helps teams easily track & automate tasks