PetaSAN - PetaSAN is an open source Scale-Out SAN solution offering massive scalability and performance.
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.
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.
XigmaNAS - File Sharing, OS & Utilities, and Security & Privacy
Dell EMC UnityVSA - dell-emc-unityvsa-overview-deployment
ReadyNAS - ReadyNAS by NETGEAR.