OpenMediaVault, Proxmox Virtual Environment, Western Digital My Cloud, Rockstor, ReadyNAS, PetaSAN, Openfiler, StableBit DrivePool, SnapRAID, ZFSguru, Windows Storage Spaces, ESOS, FlexRaid T-Raid, napp-it, Open-E Data Storage Software SOHO, Greyhole, btrfs, EON ZFS Storage, PoolHD are some alternatives to Unraid.