Commerce.cgi
   This version includes the ability to use iTransact or AuthorizeNet for credit card processing. Uses the GNU license.
   http://www.commerce-cgi.com/

CommerceSQL
   MySQL database driven application for larger merchants with many products.
   http://commercesql.com/

EZ-Powercart
   Free application from company offering hosting services and other freebies.
   http://www.ez-powercart.com/

Html-Cart
   Free html shopping cart program, very easy to install with store manager application. Demo and download available.
   http://html-cart.com/

Interchange
   Open source alternative to commercial commerce servers and application server/component applications.
   http://www.icdevgroup.org/

Mal's Ecommerce
   Remotely hosted system that can be built into any existing web site.
   http://www.ait2000.com/

VIPcart.com
   Same day setup on free service. More advanced features on VIP service that's available for fee.
   http://vipcart.com/

WebPeddle
   Application implented on an existing site. Supports linking to ImagineNation credit card processing service.
   http://webpeddle.com/

eButtonz
   Application for building online store. Same day setup. Free version has vendor advertisements.
   http://www.ebuttonz.com/index.html

eComPal
   Free service available with varying higher monthly cost options also. Works with QuickBooks.
   http://www.ecompal.com/