ESOS is described as '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)'. There are more than 10 alternatives to ESOS for a variety of platforms, including Linux, Windows, VMware vSphere Hypervisor, Self-Hosted solutions and Mac. The best alternative is OpenMediaVault, which is both free and Open Source. Other great apps like ESOS are TrueNAS (Free, Open Source), Unraid (Paid), XigmaNAS (Free, Open Source) and Gigatribe (Free).
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.
TrueNAS (formerly FreeNAS) is an operating system that can be installed on virtually any hardware platform to share data over a network. TrueNAS is the simplest way to create a centralized and easily accessible place for your data.
An operating system for personal and small business use that brings enterprise-class features letting you configure your computer systems to maximize performance and capacity using any combination of applications, VMs, storage devices, and hardware.
[NOTE: new Mac version and Windows beta version 3.5 were released in December 2019] Gigatribe is a p2p software with more than 1 Million users. Its an easy way to share and transfer files between friends or colleagues.
StorPool is an intelligent software-defined storage solution that allows service providers, enterprises and other Cloud builders to run data storage on standard x86 servers, instead of on expensive and inefficient storage arrays (SANs).
Rockstor is a free and open source NAS (Network Attached Storage) operating system. It’s a software solution and can be installed on commodity hardware or a hypervisor satisfying minimum system requirements.
The Amahi Home Server is designed for home and small office environments where the technical support staff do not want the job! It is easy to use and offers cross-platform compatibility (PCs, Mac, GNU/Linux, Playstation, Xbox, you name it.
ReadyNAS OS ReadyNAS OS is based from Linux and is exclusive for the ReadyNAS products and can be controlled by web address (example 192.168.0.20) and has many features like app support (Plex, PHP, etc) ReadyNAS Desktop Series
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.