Phpshop

phpShop is a free PHP-based e-commerce application developed by Edikon.

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Developer: Developers
License: GNU General Public License (GPL)
Operating System: PHP version 4.3.4 or later and mySQL 3.22 or later

VirtueMart is a complete Open Source E-Commerce (Shopping Cart) solution with a lot of features.

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Developer: Soeren Eberhardt
License: Freeware
Operating System: linux, windows, freebsd, osx, sun