Nextcloud

What it's for

Your own cloud: files, calendar, contacts, photos, notes and collaborative documents, on your server.

Why it matters

It’s the full replacement for Google Drive, Calendar and Contacts, but at home. You choose the jurisdiction and no one else controls your files. Note: it’s “your server” privacy, not end-to-end encryption by default; you must keep it updated.

For whom & when

Self-hosters. The easiest path is to install it via YunoHost or Umbrel.