Everyone seemed to post on Cube so I will write to your other option Virtuemart. There is osCommerce as an original Open Source Cart. From there you have several options for carts including the leaders CRE Loaded and Zen Cart which give you bundles of prepackaged osCom installs (and I would recommend those over a standard osCommerce site). Now besides the carts there were Content Management Systems, such as Joomla and Mambo (still seem the same to me…but Zen and CRE are only just now starting to have some true differences).

Some users liked the CMS’ but they wanted to keep these and THEN get a cart. That is where you get Virtuemart. It is a GREAT shopping cart…or CMS turned shopping cart system. It is basically a Joomla/Mambo platform with the osCom module inserted.

What is the point of the history lesson? Since they are all connected to open source and the osCommerce cart they can ALL be made SEO friendly. If they do not have it already all you would need is the SEO Friendly URL contribution and a Site Map (spider food) contribution. Others can recommend more, but this is the core of what you need. The cart already comes with the Froogle feed, and you can get the new Google Base install as well or have custom files created for other Inorganic SEO work.

So…if it is open source…YES…it either is or can easily be SEO friendly (they can be indexed without the site map and SEO URLs but they really do help and are worth having). Now....that doesnt mean you slap the site up and your products appear on page one of google....but you have what you need to get there.