VirtueMart - VirtueMart is an open source e-commerce solution designed as an extension of the Mambo or Joomla!

eBay - Buy and sell electronics, cars, fashion apparel, collectibles, sporting goods, digital cameras, baby items, coupons, and everything else on eBay, the world's online marketplace

Shopping feed - Shopping feed is a versatile eCommerce application that allows eCommerce stores to thousands of channels.

eBid - eBid. The worlds online auction marketplace.

Thirty Bees - Open e-commerce platform designed to work out of the box.

Listia - Place bids and shop for items that other people place on Listia. The app is easy to use and understand, and you don't need a lot of money to get started or to make purchases.