• Alepo Radius Server Commercial - With Cisco VSA handling for VoIP
• Advanced Communications Commercial
• Aradial RADIUS Server Aradial Commercial
• BSDRadius optimized for VoIP - Free, BSD License
• Cisco Secure Access Control Server Commercial
• Cistron RADIUS Server GPL
• ClearBox TACACS+ RADIUS Server Commercial
• DataTechLabs Radius VoIP Billing - Commercial
• FreeRADIUS GPL
• GNU Radius GPL
• ICRadius GPL
• Linktrans Canada has developed such software to realize the 3A functions
• Lucent Technologies NavisRadius Authentication Server Commercial
• Microsoft Internet Authentication Service Commercial
• OpenRADIUS GPL
• RAD-Series RADIUS Server Commercial
• Radiator Commercial - in Perl
• IEA Software RadiusNT/X Commercial
• Funk Steel-Belted Radius Commercial
• VOP Radius Commercial
• SysMaster VoIP Billing Commercial - Best RADIUS based VoIP Billing server for use in Calling Cards, Wholesale VoIP, Residential VoIP, Callshops, Internet Cafes etc.
• XTRadius Freeware
• YARDRADIUS BSD License
• SysMaster VoiceMaster Radius Billing - Commercial
• CW Radius Radius for Asterisk - Commercial

Reviews

• Enterprise RADIUS Servers
• Infoworld
• RADIUS Servers: Funk And Shiva Go Head-To-Head