Freeform

Freeform is a digital whiteboarding application developed by Apple. It is a free app that allows users to create different boards, which can comprise a range of inputs including text notes, photos, documents, and web links. 

Freeform is a tool for collaborative content creation because it allows multiple users to work on the same document at the same time. This makes it ideal for brainstorming, planning, and creative projects.

It is easy to use, supports a variety of input methods, and integrates with other Apple apps. If you are looking for a tool to help you collaborate on documents, Freeform is a great option.