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.
TrueNAS Core - TrueNAS Core (formerly FreeNAS) is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.
XigmaNAS - File Sharing, OS & Utilities, and Security & Privacy
PetaSAN - PetaSAN is an open source Scale-Out SAN solution offering massive scalability and performance.
Dell EMC UnityVSA - dell-emc-unityvsa-overview-deployment
ReadyNAS - ReadyNAS by NETGEAR.