wpStoreCart by jquindlen is an open source eCommerce solution for WordPress that allows you to quickly and easily sell your physical and digital downloads using your new or existing WordPress website.
There are free and premium versions.
Download: http://wordpress.org/extend/plugins/wpstorecart/
Info:
FAQ: http://wpstorecart.com/faq/
DOCUMENTATION: http://wpstorecart.com/documentation/
INSTALLATION: http://wpstorecart.com/documentation/installation/
FORUMS: http://wpstorecart.com/forum/
HELP: http://wpstorecart.com/help-support/
