The billing softwares that I know at below:

Whois.Cart()
AWBS
ModernBill
WHM AutoPilot
ClientExec
AgileBill
Perlbill
Logicbill
A Plus Bill
WHMCS
AutoHost
DRZES
SolidState
PHP Invoice
AccountLab
Ubersmith
phpCOIN

If you know other than these when write them in here, please.

Lpanel is another.

EDIT- Nevermind, its up there

SSX HOST nice april fools joke on your site lol

SSX HOST nice april fools joke on your site lol

haha, thanks.

It was my friend's idea.

thanks for the timely information.

I am looking for a billing package that integrates into plesk to the point that the person purchses a site and it adds the information to plesk.

thanks in advance

Woa, is there that many different?
Not many well known i would guess?

If only want a hosting order script DHcart is good too,but i no money to buy:(

Another one - http://polyspaston.com/hostdirector.html :)