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Nextcloud is a collaboration platform centered on file sync and sharing, integrating an office suite, calendar, email, and video conferencing. It is widely used as a self-hosted alternative to Google Workspace and Microsoft 365.

• File sync and sharing with seamless cross-device synchronization via desktop and mobile clients
• Nextcloud Office for collaborative document editing based on LibreOffice Online
• Talk for integrated video conferencing, chat, and screen sharing
• Calendar and contacts management using CalDAV/CardDAV standard protocols
• End-to-end encryption at the folder level for sensitive data
• App store with 400+ extensions including task management, notes, and kanban boards

Built in PHP running on Apache/Nginx with MySQL or PostgreSQL, Nextcloud is deployed by the German federal government, French government, and numerous public institutions worldwide.