Python,SugarCRM,RoR,Phpfox,Boonex,Joomla, Drupal,ZendFramework,Prestashop,Cakephp, Wordpress, Magento, OsCommerce,ZenCart,OpenCart,Xcart,CreLoaded etc. And, also integrated applications with third-party APIs like Payment Gateways (PayPal, Authorize.Net, Google Checkout, Amazon,Knet), Shipping Gateways (UPS, USPS, FedEx etc) using JSON/XML and Apple iOS (iPhone, iPad), Android, Blackberry.