http://phpxref.com

billing software $24.95/month for 1000 clients or $49.95 for 2500 clients http://www.modernbill.com/billing-software/order.php

http://www.novadeck.com/main/articlecomplet.xml?id=40&mod=false&pgmenu=

http://www.elitecms.com/ISP_Solutions.index

http://www.sitegaloreplus.com/features.htm