The best replacement for freeradius is openradius.

The best alternatives to freeradius are rated as following:
★★★★★  openradius
★★★★  radiator
★★★★  gnu radius
★★★  daloradius
★★  tekradius
★★  freediameter
★  freeradius2

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

Other search terms related to freeradius and their ratings are:
★★★★★ cisco
★★★ mikrotik
★★ mac authentication
★ daloradius
You have in mind a companion for freeradius and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of freeradius in all years. Click on graph for more.
freeradius
openradius
radiator