Freeradius Billing Account Management

[Pratchaya Chatuphian]

Billing Account Management
=======================

I 've successful about installation freeradius + mysql + dd-wrt (
using chillispot ).
Now, i need you help.

Would you like to suggestion me about "Hotspot Billing Account
Management" ?
that can provide postpaid/prepaid and register/sign up new user and
can be refill internet time .

Anybody have experience about this ?

Thank you very much
Best Regards.,
PT

Ps. have it a opensource ?