Very easy to use. Organize different types of notes. Make amazing mind-maps!

Excellent for technical documentation, software teams. You own your content. You keep your own content in your Github repository. Edit your content in any editor, outside of Gitbook, and the changes will be reflected in Gitbook, and hosted on the Gitbook generated site. No other notes/documentation tool can do this!

Mostly a project management tool, but it includes a knowledge base editor also!