A storage server built with server class hardware, and FreeBSD as the operating system.
The current version is RAIDzilla 2.5, which is an upgrade to the RAIDzilla II project (it used FreeBSD 8.x). RAIDzilla 2.5 uses FreeBSD 10.x (10.3-stable) as the operating system. The original RAIDzilla project used FreeBSD 6.x and 7.x as operating system. Interesting and detailed descriptions.