I've been wondering because they look very similar and have similar product customization. I would love to know, because it's obvious they didn't write it themselves but I couldn't find any credit in the source code either. Can anyone identify it?
I am not sure about this, but huge enterprices will come up with their own CMS adn own E-Commerce system for security and maintain their reputation. more sugestion?
Often the front-end is customized, but as back-end the large players either develop themselves or use solutions such as iCongo, Hybris, Venda or even Magento Enterprise