Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Sketch Repo - Collection of resources for anyone who uses 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.
SketchApp.rocks - Index of all awesome things related to Sketch.
Perfect Wiki - Build and organize your knowledge base of company resources without switching between workspaces
Flow - Stop managing projects from your inbox.