Nextcloud

Nextcloud is a free, open-source suite for file hosting on a server you control. It includes end-to-end encryption (E2EE), office suite integration, and collaboration tools.

• Complete self-hosted cloud solution
• File storage and synchronization
• Web office suite integration
• Video calls and meetings
• Calendar and contacts
• End-to-end encryption available
• Large app store of plugins and extensions

The app store adds file storage, web office, calls, meetings, calendar, contacts, and other features.