Our shopping cart of choice is oscommerce.
osCommerce is an online shop e-commerce solution under on going development by the open source community. Its feature packed out-of-the-box installation allows store owners to setup, run, and maintain their online stores with minimum effort with no costs or license fees involved.

osCommerce combines open source solutions to provide a free and open e-commerce platform, which includes the powerful PHP web scripting language, the stable Apache web server, and the fast MySQL database server.

With no restrictions or special requirements, osCommerce is able to run on any PHP enabled web server, on any environment that PHP and MySQL supports, which includes Linux, Solaris, BSD, Mac OS X, and Microsoft Windows environments.

OsCommerce has the following payment gateways built in by default:

	Payment gateway
	Payment gateway
NOCHEX	Payment processor without merchant account - for For UK customers only
	Payment processor (no merchant account necessary)
2CheckOut	Payment processor (no merchant account necessary)
	Merchant Account and gateway or gateway only For US and Canadian customers Rates and Signup
	Merchant account provider - For UK customers only

Shipping options built in by default