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 PhpNuxBill Support Radius , but with limited feature
 
+FreeRADIUS is a modular, high performance free RADIUS suite developed and distributed under the GNU General Public License, version 2, and is free for download and use.
+
+RADIUS servers receive user connection requests, authenticate the user, and then return the configuration information necessary for the client to deliver service to the user. A RADIUS server can act as a proxy client to other RADIUS servers or other kinds of authentication servers.
+
 ## Freeradius
 Install Freeradius on your Linux, Follow instruction in here https://networkradius.com/packages/