OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
FreeNAS - FreeNAS is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.
Rockstor - Rockstor is a free and open source NAS (Network Attached Storage) operating system.
SnapRAID - A backup program for disk arrays. It stores parity information of your data and it recovers from up to six disk failures.
Unraid - Simplicity. Flexibility. Scalability. Modularity. Unraid empowers you to build the system you’ve always wanted using your preferred hardware, software, and operating systems.
StableBit DrivePool - State of the art, file based drive pooling software.