From: "Andrei Antonelli" <andrei at hcrp dot fmrp dot usp dot br>

> but some radius server software free, someone knows ?

> Thanks v much

Someone beat me on the replies, but I have better links. :-)

WinRADIUS
http://www.itconsult2000.com/en/product/WinRadius.html
I know nothing about it other than it exists.

MultiTech RADIUS Server v 2.01
http://www.multitech.com/SUPPORT/Updates/software/software_by_filename.asp
Scroll down to radius201.exe
Said to work in the lists.

FreeRADIUS for win32
http://www.freeradius.net/
Should be the most "free" and standard, and FreeRADIUS for *nix is what many 
people use.