ShopCMS is an advanced paypal shopping cart, catalog manager and CMS. It is free and supports full paypal shopping cart integration, customizable templates, runs on the mySQL database, has parent and subcategories with multi-level navigation controls, works with mod_perl, php version available, and MUCH MORE. ShopCMS Paypal Shopping Cart is licensed as open source software.
Coding Library:
PHP Perl
More Paypal Resources:
