Google Docs
Write and edit documents together in real time.

Price, ratings and what each one does, side by side. Every fact here comes from their listings on Linkstore.
Write and edit documents together in real time.

Docs, wikis and project tracking in one workspace.
NotionShared editing, comments and suggestions, with version history so nothing gets lost.
More about Google DocsWrite pages, build databases and plan projects with blocks you can rearrange. Works for one person or a whole company.
More about NotionApps that do a similar job, closest matches first.