eCommerce Software / Systems
There is a huge range of options available for eCommerce, but there is no “best” solution. What is right for one business will not suit another. If you are looking for a little help and guidance, then SitePoint has two relevant articles, one on [hosted solutions, and one on [URL="http://www.sitepoint.com/shopping-cart-solutions/"]shopping carts](http://www.sitepoint.com/hosted-shopping-cart-solutions/).
The following lists are not exhaustive, but should give you a good start in looking for the right solution to meet your own criteria.
Hosted Storefront Creation Services
FREE Shopping Cart Solutions
Paid Shopping Cart Solutions
Updated and expanded from a list started by beley.