OpenCart is Fast, Reliable and Responsive Solution with No monthly fees, no catches; just an effective and customizable platform for your new ecommerce store. This open source shopping cart solution developed to fit the needs of modern online merchants. It enables you to start selling with user-friendly, easy to use and visually attractive interface.
The special about OpenCart is that it’s code is clean and well structured, also OpenCart is not "picky" when it comes to server resources. Another good thing about OpenCart is that it has many extensions, both free and commercial ones, so users can easily improve the functionality of their eCommerce sites.