openmediavault is the next generation network attached storage (NAS) solution based on Debian Linux. It contains services like SSH, (S)FTP, SMB/CIFS, DAAP media server, RSync, BitTorrent client and many more. Thanks to the modular design of the framework it can be enhanced via plugins. openmediavault is primarily designed to be used in home environments or small home offices, but is not limited to those scenarios.
Certainly for more technical users but the less technical do prefer to stay on a packaged solution. The Docker stuff though is probably more functionally interesting than the OMV side itself.