Radiator is a highly configurable and flexible Radius server.
FreeRADIUS is a feature-rich, high-performance RADIUS server.
A server for remote user authentication and accounting
Free Radius Client developed in Java (RFCs 2865 and 2866 compliant)
daloRADIUS is an advanced RADIUS web management application aimed at managing hotspots and general-purpose ISP deployments.
JRadius – Open-source Java RADIUS client and server framework
GK RADIUS is a free opensource implementation of RADIUS protocol and database logic by DTL ODBC.
radutmped is a utility that can remove utmp entries from radutmp files of several RADIUS servers.