You can also self-host Office: https://learn.microsoft.com/en-us/officeonlineserver/office-online-server https://learn.microsoft.com/en-us/officeonlineserver/of

You can also self-host Office: https://learn.microsoft.com/en-us/officeonlineserver/office-online-server https://learn.microsoft.com/en-us/officeonlineserver/office-... The protocol that connects the office suite to the file sharing platform is called WOPI (https://en.wikipedia.org/wiki/Web_Application_Open_Platform_Interface https://en.wikipedia.org/wiki/Web_Application_Open_Platform_...). OneDrive/Dropbox/Nextcloud all seem to support it. Seems like Collabora and OnlyOffice are the two big players right now.