Amahi Home Server!

FreeNAS is a free NAS (Network-Attached Storage) server, supporting: CIFS (samba), FTP, NFS, AFP, RSYNC, iSCSI protocols, S.M.A.R.T., local user authentication, Software RAID (0,1,5) with a Full WEB configuration interface. FreeNAS takes less than 32MB once installed on Compact Flash, hard drive or USB key.The minimal FreeBSD distribution, Web interface, PHP scripts and documentation are based on M0n0wall.

ClearOS is a family of operating systems for the enterprise, small business, and home. There are three editions to choose from depending on your needs and suitable to your abilities. They are: ClearOS Enterprise, ClearOS Home, and ClearOS Core.

Zentyal is a native Microsoft Active Directory® implementation on Linux incorporating all the network services required in a small and medium business environment: Directory & Domain Server, Mail Server, Gateway and Infrastructure Server.

NAS4Free is an embedded Open Source Storage NAS (Network-Attached Storage) distribution based on FreeBSD. This project is a continuation of FreeNAS 7 series project.

Univention Corporate Server is a pre-configured Linux server operating system free of charge. It's the best fit to provide Microsoft Server-like services on the cloud or on the premises, to run and operate corporate IT environments with Windows- and Linux-based clients and to extend those environments with proven enterprise software, also either on the cloud or on the premises.

Windows Server 2012, codenamed "Windows Server 8", is the sixth release of Windows Server. It is the server version of Windows 8 and succeeds Windows Server 2008 R2. Two pre-release versions, a developer preview and a beta version, were released during development. The software was generally available to customers starting on September 4, 2012.

Are you one of many home users who store a lot of personal data, accumulated over the years, and want to store those in a safe and cool way? Then consider the advantages of using ZFSguru:

A napp-it is a high-quality block- and filestorage on common and favourable server hardware from ex. DataOn, Dell, HP or SuperMicro paired with a solid server OS (preferable Omnios/ OI/ Solaris but now with ZFS and job/ snap management on Linux) with an easy online installer and webbased GUI management with additional Pro extensions and server replication.

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.

Windows Server Essentials (formerly Windows Small Business Server) is a flexible, affordable, and easy-to-use server solution designed and priced for small businesses with up to 25 users and 50 devices. Windows Server Essentials is an ideal first server, and it can also be used as the primary server in a multi-server environment for small businesses. Download the Windows Server 2012 R2 Essentials evaluation.

What is EON?Embedded Operating system/Networking is a small operating system, built on Solaris, designed to store any amount of digital data on Intel/AMD (x86) hardware, using the amazing, enterprise class Zettabyte File System.

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 into a disk array that sits on your enterprise Storage Area Network (SAN) providing sharable block-level storage volumes. Typical uses for an ESOS® "storage server" include VMFS datastores on VMware ESX/ESXi, Windows NTFS volumes, Linux disks, etc. »

Open-E Data Storage Software V7 SOHO (Small Office Home Office) is a free version of Open-E DSS V7, previously known as Open-E DSS V7 Lite. With SOHO, you can take advantage of basic functionalities of our fully featured NAS / SAN software platform

Just like that, your Mac is a powerful server.