The best open source alternative to TrueNAS is openmediavault. If that doesn't suit you, our users have ranked more than 10 alternatives to TrueNAS and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to TrueNAS are XigmaNAS, Rockstor, Amahi Home Server and EasyNAS.
openmediavault is the next generation network attached storage (NAS) solution based on Debian Linux. It contains services like SSH, (S)FTP, SMB/CIFS, DAAP media server, RSync, BitTorrent client and many more. It can be enhanced via plugins.
Faster and lighter weight than FreeNAS.
XigmaNAS (formerly NAS4Free) is an embedded Open Source Storage NAS (Network-Attached Storage) distribution based on FreeBSD. This project is a continuation of TrueNAS 7 series project.
adding more disks is much easier than freenas. i have implemented it for client.
The Amahi Home Server is designed for home and small office environments where the technical support staff do not want the job!
It uses openSUSE Leap as a base with the Btrfs advanced file system. EasyNAS is managed through a web-based interface and offers such features as on-line growing of file systems, snapshots and copy-on-write.
Enterprise Storage OS® is a quasi Linux distribution based on the excellent SCST project; its purpose is to provide SCSI targets via a compatible SAN (Fibre Channel, InfiniBand, iSCSI, FCoE). In a nutshell, ESOS® can easily turn a server with the appropriate hardware...
PetaSAN is an open source Scale-Out SAN solution offering massive scalability and performance. PetaSAN uses modern cloud based technologies to provide the elasticity and agility to scale up the storage cluster simply by adding more nodes.
OviOS Linux is a specialized Linux distribution aimed at creating the fastest and easiest Linux unified storage server. It requires no knowledge of Linux, NFS, SMB or iSCSI protocols to create a fully functional storage server in less than 10 minutes, simply by following the 4...
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I use it for over three years now without any major problem. It's based on Debian and very stable. The interface is smooth and all works great. I use OMV for backup, file server, media server (DLNA), downloads (YT and torrent) and it performs and extra virus scan on all my files.