What are some alternatives?
When comparing Amahi Home Server and FreeNAS, you can also consider the following products
OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
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.
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.
unRAID Server - A scalable, consumer-oriented, server operating system.