PetaSAN - PetaSAN is an open source Scale-Out SAN solution offering massive scalability and performance.
TrueNAS Core - TrueNAS Core (formerly FreeNAS) is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.
Amahi - 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.
XigmaNAS - File Sharing, OS & Utilities, and Security & Privacy
OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
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.