Webuzo for Freeway 1.4.3.210
reeway is by far the largest and most fully featured Open Source eCommerce platform. It doesn't just sell products but extends to sell in some very fancy new ways and is very configurable. For example, you can just sell products if you are not interested in the other selling methods.
You will find Freeway has very strong CRM features as well as a useful and simple CMS as well.