Magento is quite new software (it’s only up to version 1.2.1.2 March 3, 2009) but is already shaping up to be one of the best e-commerce carts out there. Magento features clean urls and SEO from the start. Everything is designed in a clean and simple way. The code it outputs is semantic, which is very rare for e-commerce carts, even commercial ones.
Magento has lots of features and everything is for free. Here is the most important features which you can’t get in lots of others carts.
Management:
You can control multiple …

osCommerce is a free, open source online shop software. The default installation includes a large number of features that you can easily enable and configure. You can easily install osCommerce on your website with the help of the Fantastico auto-installer.
With osCommerce shopping cart you can add multiple products on your site, organize them in categories, set discounts and special promotions. osCommerce allows you to accept all popular payment methods: PayPal, credit cards, cheques. osCommerce has a built-in shipping and tax functionalities.
It also supports multiple currencies, allows customers to print invoices …