LiteCart – Free & Simplistic E-Commerce App
LiteCart is a free and open source shopping cart application that is built with PHP-MySQL.
It is light, not in means of features but for the usage (less clicks, improved usability..) and for development.
All the main features of an e-store is offered as a standard and more stuff exist like: product groups, different prices per currency, automatic backups and more.
And, there is an easy-to-use control panel for setting up the store and managing everything about it.