Are you looking for PHP open source applications. Just take a look at this post the best open source ECOMMERCE softwares. Try these with XAMPP 1.6.8 (Complete Pack) website link click here
Few days back I had experimented it's really powerful software but it's working on XAMPP Ver 1.6.8
Zen Cart™ truly is the art of e-commerce; free, user-friendly, open source shopping cart software. The ecommerce web site design program is being developed by a group of like-minded shop owners, programmers, designers, and consultants that think ecommerce web design could be and should be done differently.
A free online shop program featuring order history, shopping carts, full search capability, product reviews and secure transactions.
CRE Loaded™ is much more than your average shopping cart. It's the industry's first downloadable ecommerce system.
Don't forget with this one very powerfull ecomerce and nice design with lot of feature AJAX.
http://www.prestashop.com
"PrestaShop™ is professional e-Commerce shopping cart software that you can download and use for free"
BTW, XAMPP is now Version 1.7.3a
(Apache 2.2.14, MySQL 5.1.41, PHP 5.3.1, etc...)
http://www.opencart.com is my choice, they use MVC and PHP5!
Nice post!
My choice is OScommerce , it has plenty of add-ons modules and easy to customize.
magento was open source and free at the beginning but now the free version is out date and they have a "pro version" and is paid.