Link Master --> OSCommerce

http://forums.oscommerce.com/topic/45279-add-to-cart-from-external-page-or-site/

http://addons.oscommerce.com/info/4720

http://forums.oscommerce.com/topic/373027-how-would-i-list-the-product-categories-on-an-external-page/

http://www.oscommerce.com/community/contributions,7877

http://www.oscommerce.com/community/contributions,2657

http://www.oscommerce.com/community/contributions,6340/page,67

http://www.oscommerce.com/community/contributions,500