The best Operating System alternative to openmediavault is Unraid. It's not free, so if you're looking for a free alternative, you could try ZimaOS or EasyNAS. If that doesn't suit you, our users have ranked more than 10 alternatives to openmediavault and three of them are Operating Systems so hopefully you can find a suitable replacement.
Flexible operating system combining storage management with support for mixed drive sizes, Docker containers, virtual machines, hardware and GPU passthrough, browser-based interface, file protocols, scalable expansion, integrated parity, and monitoring features.
It uses openSUSE Leap as a base with the Btrfs advanced file system. EasyNAS is managed through a web-based interface and offers such features as on-line growing of file systems, snapshots and copy-on-write.
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