Boards - Create inspiration boards of files and notes.
Managify - Create & organize all your documents in a single platform.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
IDocument - Feel powerless of your documents chaos in your Mac?
TheBrain - TheBrain: The Ultimate Digital Memory
Quip: Team Documents for Slack - Create, share and get notified about Quip docs in Slack