NAS4Free is an embedded Open Source Storage distribution and supports sharing across Windows, Apple, and UNIX-like systems.
It includes ZFS, Software RAID (0,1,5), disk encryption, S.M.A.R.T, email reports etc. with following protocols: CIFS (samba), FTP, NFS, TFTP, AFP, RSYNC, Unison, iSCSI, UPnP, Bittorent (initiator and target), Bridge, CARP (Common Address Redundancy Protocol) and HAST (Highly Available Storage).
All this can easy be setup by it's highly configurable WEB interface.
NAS4Free can be installed on Compact Flash/USB/SSD media, Hard disk or booted of from a LiveCD with a usb stick.