Radiator is by far the best RADIUS server around. It has a huge range of plug
in modules, and it can be configured to do almost anything you can imagine. And
the support is absolutely the best anywhere.

We have used it on a number of projects, and it is completely reliable. Its
easy to configure and works with any database on any platform you may want. We
have used to it solve a number of difficult authentication needs that no
other RADIUS server could come close to.

Don't waste your time with any other commercial or free RADIUS server.
I cant recommend Radiator highly enough. Great work guys!