Radiator is a highly configurable and flexible Radius server that supports authentication by nearly 60 different types of authentication methods such as Flat files, DBM files, Unix password files, SQL databases, remote Radius servers (proxying), external programs, NT User Manager, Active Directory, LDAP, PAM, iPASS, GoRemote, NIS+, Tacacs+, Web URL, Vasco Digipass, a wide range of ISP billing packages such as Emerald, Platypus, Rodopi, Hawk-i, Interbiller98, Freeside etc, your legacy user database etc, etc. Radiator home is
here.