SUMMARY: Robust/feature-rich RADIUS server

Thanks for all private and public answers. Besides the two I mentioned
on the original posting (NavisRadius and Interlink), two other RADIUS
servers seems to be quite popular and trusted by various NANOG readers:
- Radiator (
- Steel-Belted Radius (

The following products have received one or two mentions:
- Widespan (
- FreeRadius (
- Navipath (no longer in business)
- Cisco Access Registrar (

Rubens Kuhl Jr.