XWIKI
XWIKI seems to be equal with features like confluence. Has 600 extensions, including oAuth or OnlyOffice.
Installation via apt (recommended), with postgres:
sudo apt-get install xwiki-tomcat9-pgsqlSee https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Installation/InstallationViaAPT/
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information