osCommerce 4 is a modern, free and open-source Shopping Cart inspired by the old osCommerce, but not based on the obsolete osCommerce 2.x code. It's a modular, feature-rich E-commerce platform ready for small and medium businesses. osCommerce 4 is working fast, even on low-hosting plans, and it's one of the fastest open-source E-commerce platforms.

It was free and fairly easy to set up for a basic small business ecommerce site.

OsCommerce was a true Opensource eCommerce package, which back in the early 2000s became a great choice for e-commerce web development. We liked the fact that it was built using PHP and was extendible to our needs, I believe it was one of the first OS cart systems to employ PHP. It's great that OsCommerce is being revived by a new development team and we are waiting for version 4 in anticipation!