What are some alternatives?
When comparing FreeNAS and OpenMediaVault, you can also consider the following products
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.
Rockstor - Rockstor is a free and open source NAS (Network Attached Storage) operating system.
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
unRAID Server - A scalable, consumer-oriented, server operating system.
ClearOS - A very good alternative for Windows Server, for free
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.