Please check following pages for available addons.

http://www.oscommerce-manager.com/PAGE-63-store-manager-plugins.html

http://www.creloaded-manager.com/PAGE-82-store-manager-addons.html

http://xcart-manager.com/PAGE-67-store-manager-addons.html

http://www.zencart-manager.com/PAGE-82-store-manager-addons.html

Find more about Addons functionality from Mass Product Changer, Mail Order Management and Mass AdWords Product Ads online documentation.