is robust, professional grade e-Commerce shopping cart that you can download, install, and use for free. In the back end, you will use a full featured back end to manage your inventory, orders, shipping, and customers in real time. Your customer’s payments are sent directly to your commercial bank account using the latest security technology. You can even add your own modules to the shopping cart.
is an open source PHP based online shopping cart system. OpenCart is easy to use and is SEO optimized with a very nice interface. A great feature of OpenCart is that customers can write their own reviews of the products.
Web Development
1. Use A Reset Stylesheet
Stupid, but true: No two browsers use the same presentation defaults. Differences in padding, margins, headings, and indentations are rampant. If you want your page layout to be more consistent across browsers, it pays to start with a CSS Reset stylesheet.

Two I recommend:
Yahoo’s CSS Reset Stylesheet
Eric Meyer’s CSS Reset Stylesheet
