Nextcloud is an open-source (AGPL-3.0), self-hostable content collaboration and file-sync platform positioned explicitly as a European, data-sovereign alternative to Microsoft 365 and Google Workspace. Founded by Frank Karlitschek (also founder of ownCloud), Nextcloud GmbH is profitable, has grown bookings 50-70% year-over-year, and deliberately operates without venture capital or other external funding, with real customers including the German Federal Administration.