Zen Cart - www.zen-cart.com Versions: Zen Cart 1.3.x Zen Cart is an open source online store management system. It is PHP-based, using a MySQL database and HTML components. Providing support for many languages and currencies, it is available for free.

Zen Cart advantages:
+ Stable
+ No licensing fees
+ Many contributions from osCommerce already installed
+ Nicer looking default designs pre-installed

Zen Cart disadvantages:
- Not possible to use osCommerce contributions, they must be converted to Zen Cart
- Admin interface is a little messy in certain areas, as there are many contributions installed

"Zen Cart" is registered trademark of Zen Ventures, LLC.