DHCart is a PHP based application and can be used simply to receive domain and hosting service orders. Checking domain availability, whois lookup, adding domain and hosting services to the shopping cart and completing order are all controlled from one page. Works with over 400 domain extensions, supports a lot of payment gateways and can be easily added to most site layouts within moments.

Script Features
Uses PHP available on most Unix and Windows servers.
Works with over 400 domain extensions.
Determines domain availability.
Ability whois search.
Any registration periods and prices allowed for each domain extension.
Option to select hosting package for each domain name(if you enable it).
Providing discount or free domain with hosting.
Required minumum price of hosting plan can be set for providing discount/free domain.
Selecting a hosting plan can be set as required with domain registration.
Supports domain transfers(if you enable it).
Easy to add your own page layout * even inside a table cell. Or can be used ready made order page by adding header and footer code of your page layout in. Style can be changed by editing the CSS file.
Easy to include only the domain extensions you wish to sell and support.
Built in support for 2checkout, Paypal, Moneybookers, Nochex, E-Gold, Google Checkout, Worldpay Futurepay, Ideal(ING, Rabo, ABN AMRO), Paymate, CDGCommerce, Authorize.net, Payza, OKPAY, Liberty Reserve, Cashu, DIXIPAY, OneCard and manual processing. It can be integrate to one more payment gateway other than these, too.
Supports monthly recurring billing on Paypal, Moneybookers, Worldpay Futurepay, CDGCommerce and Payza.
Sends email to customer and vendor with order details at checkout(supports SMTP authentication).
Supports Tax.
Supports any currency symbol and/or currency name.
Supports auto and manual currency conversion. It can be convert default currency to payment gateway's currency automatically. It gets exchange rates from Google. Or you can define exchange rates manually for each payment gateway.
Uses language file for easy translation.
User defined fields for order form.
User defined email messages.
Supports coupon system. You can offer one time and/or recurring discount for hosting and/or domain.
Stopping giving orders from specific email addresses.
Excellent documentation.
And more...

Demo: http://www.dhcart.com/demo/order.php

Requirements: It required PHP5.0+ only. It works on all servers(Linux, Windows.. etc.) whether shared or dedicated.

Order: http://www.dhcart.com/order.html
(The cost for use on one domain is only $9.95 for a limited time. The license is valid forever with no requirement to renew. You can download it immediately after you paid)