ownCloud is an open-source file sync and sharing platform that provides secure cloud storage and collaboration features. It allows users to store, access, and share files from any device while offering full control over their data with encryption and self-hosting options.

Features of ownCloud:

• Secure file syncing and sharing with end-to-end encryption options.
• Web-based interface for easy access to files from any device.
• Collaboration tools for file versioning, comments, and activity feeds.
• Integration with third-party services and apps for extended functionality.

Run these commands:
$ open http://localhost/owncloud

Disclaimer: ownCloud is open-source software provided under the AGPL License. It is offered "as is," without any warranty, express or implied. Users are responsible for ensuring the ethical and legal use of ownCloud in their projects.