StableBit DrivePool - State of the art, file based drive pooling software.
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.
btrfs - Btrfs is a modern copy on write (CoW) filesystem for Linux aimed at implementing advanced features...
PetaSAN - PetaSAN is an open source Scale-Out SAN solution offering massive scalability and performance.
Greyhole - Greyhole is an application that uses Samba to create a storage pool of all your available hard drives, and allows you to create redundant copies of the files you store, in order to prevent data loss when part of your hardware fails.
Dell EMC UnityVSA - dell-emc-unityvsa-overview-deployment