StableBit DrivePool - State of the art, file based drive pooling software.
Amahi - Amahi is a media, home and app server software known for its easy-to-use user interface. Amahi has the best media, backup and web apps for small networks.
Drive Bender - Drive Bender, class leading storage pooling technology
PetaSAN - PetaSAN is an open source Scale-Out SAN solution offering massive scalability and performance.
btrfs - Btrfs is a modern copy on write (CoW) filesystem for Linux aimed at implementing advanced features...
Open-E Data Storage Software SOHO - Get Open-E DSS V7 SOHO (Small Office Home Office), a free version of Open-E DSS V7 with basic functionalities of NAS/SAN software platform.