The closest comparison to SharePoint is probably a combination of Zoho Connect, Zoho WorkDrive, and Zoho Flow. Zoho's office suite also integrates with WorkDrive and has collaborative editing. They even have a desktop app for Writer.

Even then, SharePoint is more of a platform. You can build SharePoint apps and extend it.

There isn't a comparison for SharePoint Server. There really isn't any single thing like it for on-premise.