What are some alternatives?
When comparing Drive Bender and NethServer, you can also consider the following products
StableBit DrivePool - State of the art, file based drive pooling software.
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
ClearOS - A very good alternative for Windows Server, for free
unRAID Server - A scalable, consumer-oriented, server operating system.
Univention Corporate Server - Univention Corporate Server UCS with Active Directory functions and App Center is the cost-efficient and popular successor to Microsoft's server solutions.