TrueNAS Core - TrueNAS Core (formerly FreeNAS) is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.
OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
XigmaNAS - File Sharing, OS & Utilities, and Security & Privacy
SnapRAID - A backup program for disk arrays. It stores parity information of your data and it recovers from up to six disk failures.
PetaSAN - PetaSAN is an open source Scale-Out SAN solution offering massive scalability and performance.
StableBit DrivePool - State of the art, file based drive pooling software.