StableBit DrivePool - State of the art, file based drive pooling software.
Webmin - Webmin is a web-based interface for system administration for Unix.
btrfs - Btrfs is a modern copy on write (CoW) filesystem for Linux aimed at implementing advanced features...
ClearOS - A very good alternative for Windows Server, for free
Drive Bender - Drive Bender, class leading storage pooling technology
cPanel - With its first-class support and rich feature set, cPanel & WHM has been the web hosting industry's most reliable, intuitive control panel since 1997.