I discovered Openmediavault totally by chance as I was looking at Freenas.

I looked at Freenas and I was absolutely not a fan of it for several reasons:

• Unix
• ECC significant memory requirements due to ZFS
• Jail systems to isolate processes

Openmediavault is a very nice distribution made by Volker Thiele (former Freenas) based on Debian.

The distribution has evolved significantly since the beta version and is now available in version 4.

I use it as a virtual machine through Vmware ESXI, and passthrough of the hard drives.