Swiss company Proton is further expanding its productivity suite. In addition to an email service, calendar, VPN, password manager, and drive, Proton Sheets is now available. It is an alternative to Microsoft Excel and Google Sheets, an increasingly important advantage as countries take sovereignty more seriously.



Looks to be B2B focused. I don’t see a price anywhere, but can request a quote, and their references to data sovereignty makes me think it’s “self”-hosted, as opposed to an E2EE cloud solution.
Could be wrong, I was just scanning, but it feels much more focused on big businesses with large dedicated IT departments.
https://nextcloud.com/office/