Billing Software

[B1]

Hello guys,

I was wondering if any of my fellow yellow heads knew
of any Open Source Billing Software. It's merely a
radius server that spits out a billing screen and logs
user information to a database. There is a lovely
package on the M$ side of things but we all know
that's a slap on the tush. I need to meter, and govern
wifi users after/before they authenticate. 

If anyone know of a suck animal...please point me at
em.(seen many packages but few or none allow bandwidth
governing).

Thanks B1 

=====
A healthy diet  includes Linux, Linux, and more Linux.