That Software Guy's eCommerce FAQ Page - Zen Cart, osCommerce, WooCommerce, and related topics
FAQ Glossary
LAMP
LAMP is an acronym which stands for Linux, Apache, MySQL and PHP, four components that can be used to produce a database-backed Web application.
osCommerce
osCommerce was one of the earliest open source LAMP-stack based shopping carts. The project is no longer highly active, but it is still in use.
Zen Cart
Zen Cart is an open source ecommerce system written in PHP. It was forked from osCommerce in 2003.