OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
Rockstor - Rockstor is a free and open source NAS (Network Attached Storage) operating system.
unRAID Server - A scalable, consumer-oriented, server operating system.
Amahi Home Server - 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.
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.