Nextcloud started as file sync and grew into a full collaboration suite: documents, calendar, contacts, chat, and an application ecosystem on top of the same account system.
Breadth is both its strength and its cost. A focused deployment is excellent; enabling everything at once produces a system that needs real administration.
Decisive facts
- File sync and sharing across desktop, web, and mobile
- Collaborative office documents through Collabora or OnlyOffice
- Calendar, contacts, mail, and chat as first party applications
- External storage mounts for S3, SMB, and existing shares
- Extensive app store for extending the deployment