Zoho is a set of online word processing, presentation, and spreadsheet tools. It also available as an app for iOS, and you can synchronise documents between that and the web app. The free version is limited, but there’s lots to like about it, including 1GB of storage, version tracking, and user management. Documents can be managed using Zoho Docs for
Desktop, which syncs your work with your Mac.
Collaboration and user management are key features of Zoho.