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We use Bookstack[0] for this and I can recommend it. Free and open source.

- PDF Export - Oauth2 - Revisions - History - Permissions - WYSIWYG/Markdown/Diagrams etc.

Bookstack is quite nice but last I saw it doesn't support multi user collaboration which this tool seems to include as a core feature. That can be a big differentiator for a lot of people.

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