TrueNAS, OpenMediaVault, Unraid, vSAN, Western Digital My Cloud, Rockstor, Amahi Home Server, PetaSAN, XigmaNAS, OviOS Linux, SnapRAID, StorPool, Starwind Virtual SAN, Gigatribe, StorMagic SvSAN, Dell EMC UnityVSA, LINBIT VSAN are some alternatives to ESOS.