FreeNAS

FreeNAS is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.

20 Alternatives To FreeNAS

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Amahi Home Server

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.
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ClearOS

A very good alternative for Windows Server, for free
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EMC Isilon Scale-Out NAS

Increase efficiency and agility with the powerful platform that stays simple, no matter how large your data environment.

NAS4Free

NAS4Free is the easiest and quickest way to install an Open Source free NAS server. From home NAS to enterprise network storage, NAS4Free is trusted by thousands of installations every day.

NethServer

NethServer is an operating system for Linux enthusiasts, designed for small offices and medium…

OpenMediaVault

OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.

PetaSAN

PetaSAN is an open source Scale-Out SAN solution offering massive scalability and performance.

SnapRAID

A backup program for disk arrays. It stores parity information of your data and it recovers from up to six disk failures.
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Univention Corporate Server

Univention Corporate Server UCS with Active Directory functions and App Center is the cost-efficient and popular successor to Microsoft’s server solutions.

Unraid

Simplicity. Flexibility. Scalability. Modularity. Unraid empowers you to build the system you’ve always wanted using your preferred hardware, software, and operating systems.
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Windows Home Server

Windows Home Server, code-named Quattro, is a home server operating system from Microsoft.

Zentyal

Linux directory, domain, mail, gateway and infrastructure server for SMBs.

pfSense

pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more

unRAID Server

A scalable, consumer-oriented, server operating system.