RADIUS Server
You have found the way to Server on RADIUS:
Alepo.com - Providers of full-service authentication, billing and customer management software.
Cisco Secure Access Control Server - Provides centralized control for networks of access systems. Site includes documentation.
Cistron RADIUS server - A free server implementation. Downloads and support are still available, but new development is part of the FreeRADIUS product.
Evolynx RADIUS Server - Windows based application offering authentication via Microsoft SQL server.
The FreeRADIUS Server Project - Open-source successor to Cistron. Release information, and an invitation to new developers.
Network Utilities Systems - UK distributor of Steel Belted server. Corporate information, offers and evaluations.
OpenRADIUS - Site announces the development and upcoming release of an open, flexible, modular and powerful server and proxy. Feature list and author's contact information.
Radiator - Flexible, configurable and extensible server from Open System Consultants. Information about other consulting services and products.
Radical - A free python-based packet analyzer good for evaluating and debugging server installations. Downloads and usage information.
RadiusReport - Radius log analysis program written in Perl. [GNU GPL, outdated]
Vircom - Makers of VOP Radius server. Key benefits and customer comments.
XtRadius - Freeware server allowing external processes to determine access (as from a database or other source). FAQ and mailing list information as well as downloads. [Win32] Help build the largest human-edited directory on the web.