Web based Radius administration

Hi All!

Does anyone have a web based frontend for user administration on a radius 
server?

I'm looking for something that will allow the user to administrate 
themselves, provide status of the gateways and users, and support AAA and 
billing.  I'm not looking for a commercial product as I won't be charging, 
but I do want all the features and protection of a billing based system. ( 
upload / download qoutas, bandwidth limits, time based access control, etc )

Any help would be fantastic!

Thanks!
Kevin