StorPool - StorPool is designed from the ground up to provide cloud builders, shared hosting providers and MSPs with the most resource efficient storage software on the market.
StableBit DrivePool - State of the art, file based drive pooling software.
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.
mhddfs - The driver combines a several mount points into the single one.