The best replacement for pfsense is untangle.

The best alternatives to pfsense are rated as following:
★★★★★  untangle
★★★★★  smoothwall
★★★★  ipcop
★★★★  monowall
★★  vyatta
★★  dd-wrt
★  m0n0wall
★  endian
★  tomato
★  sophos
★  ipfire
★  openwrt
★  astaro
★  zeroshell
★  mikrotik
★  iptables
  clearos
  smoothwall express
  sonicwall
  fortigate
  cisco asa
  ubiquiti
  ddwrt
  dd wrt

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

Other search terms related to pfsense and their ratings are:
★★★★★ snort
★★ untangle
★★ squidguard
★ dansguardian
★ vlan
★ dual wan
wan
You have in mind a companion for pfsense and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pfsense in all years. Click on graph for more.
pfsense
untangle
smoothwall