https://www.opendesk.eu/en/product#document-management ("Collabora Online powers openDesk with a robust office suite designed for efficient teamwork and secure document editing.")
https://en.wikipedia.org/wiki/Collabora_Online ("Collabora Online (often abbreviated as COOL) is an open-source online office suite developed by Collabora, based on LibreOffice Online, the web-based edition of the LibreOffice office suite.")
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https://www.opendesk.eu/en/product#document-management ("Collabora Online powers openDesk with a robust office suite designed for efficient teamwork and secure document editing.")
https://en.wikipedia.org/wiki/Collabora_Online ("Collabora Online (often abbreviated as COOL) is an open-source online office suite developed by Collabora, based on LibreOffice Online, the web-based edition of the LibreOffice office suite.")