There are many great programs that work for both billing, domain and cpanel integration.
Check out the following client management programs...
http://www.dramsystem.com
http://www.perlbill.com
http://www.modernbill.com
http://www.clientexec.com
http://www.whoiscart.net
http://www.Lpanel.net
For free billing software log into your hosting account, Fantastico and two scripts are easily installable for you. AccountLab Plus or phpCOIN.
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