The best replacement for freenas is openfiler.

The best alternatives to freenas are rated as following:
★★★★★  openfiler
★★★★  ubuntu
★★★★  unraid
★★★  nas4free
★★  amahi
★★  whs
★★  synology
★★  windows server
★★  windows home server
★★  freebsd
★  ubuntu server
★  openmediavault
★  naslite
★  xpenology
★  qnap
★  drobo
  opennas
  windows server 2012
  samba
  openfiler iscsi
  ubuntu zfs
  nexentastor
  openfiler performance
  nexenta

Your alternative for freenas is not listed? Suggest!
Speaking about freenas, one probably shouldn't forget about zfs.

Other search terms related to freenas and their ratings are:
★★★★★ zfs
★★★★ hardware raid
★★★ active directory
★★ raid controller
★★ crashplan
★★ esxi 5
★ esxi
web server
iscsi
You have in mind a companion for freenas and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of freenas in all years. Click on graph for more.
freenas
openfiler
ubuntu