radiusContext
- A python log analyzer for servers. Available under the Open Source license. Includes advantages and disadvantages, usage information, and latest features.
- http://www.tummy.com/Community/software/radiuscontext/

WinRadius
- Standard RADIUS server for network authentication and accounting.
- http://www.itconsult2000.com/en/product/WinRadius.html

CERT Advisory: Vulnerabilities in Various Implementations of the RADIUS Protocol
- Covers two vulnerabilities: the digest calculation buffer overflow, and the inadequate validation of the vendor-length of vendor-specific attributes.
- http://www.cert.org/advisories/CA-2002-06.html

Interlink Networks
- Providers of servers, network appliances and consulting. Site includes user group functionality.
- http://www.interlinknetworks.com