Nextcloud is an open source suite of client-server software for creating and using file hosting services. It is licensed under the GNU Affero General Public License (AGPL) version 3.0, which ensures the software remains free and open source, even when used as a network service.

Key features of Nextcloud:

• Self-hosted file sync and share solution
• Collaboration tools including calendar, contacts, and office suite
• End-to-end encryption capabilities
• Authentication and access control features

Kubernetes Compatibility:

• Official Docker images are maintained by Nextcloud GmbH
• Available on Docker Hub as 'nextcloud'
• Designed to work in containerized environments
• Includes Helm charts for Kubernetes deployment

The project is actively maintained by Nextcloud GmbH, a German company that provides enterprise support and services. They ensure regular security updates and maintain both the community and enterprise editions of the software.