Many open source shopping carts can be customized with extensions or modules, created by an active developer community.
Here is a list of app-extension marketplaces and libraries for open source shopping cart platforms. Most of the platforms are free. The extensions are both free and paid.
Magento Connect
The Magento marketplace offers over 5,000 free and paid extensions for merchants to customize and enhance every area of a store. Extensions are categorized under customer experience, site management, integrations, marketing, utilities, and themes. Magento reviews extensions from developer partners to ensure they meet specifications for security and performance.
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osCommerce Community Add-Ons
osCommerce is a popular, PHP-based shopping cart. It’s free under the GNU General Public License (GNU/GPL) agreement. osCommerce’s community add-on site contains over 6,600 free add-ons to customize online stores and help increase sales.
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PrestaShop Addons
PrestaShop is a free, modular and customizable shopping cart. Its “Addons” site features a wide variety of extensions with approximately 1,400 modules and templates. Categories include “Analytics & Stats,” “Front Office Features,” “Payments & Gateways,” “Shipping & Logistics,” and “Social Networks.”
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OpenCart Extensions
OpenCart is free PHP-based platform that’s feature-rich and easy to use. While it has a variety of out-of-the-box features, OpenCart also maintains an extension directory for its community of developers. Categories include “Market Places,” “Themes,” “Languages,” “Payment Gateways,” “Shipping Methods,” and “Modules.”
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LemonStand Marketplace
LemonStand is a PHP-based shopping cart that emphasizes flexibility and simplicity. Unlike some of its competitors, LemonStand is not free; it costs $299.98 for a single site license. Its marketplace offers a wide assortment of free and paid modules and themes by LemonStand, as well as by third-party developers. Featured categories are “Shipping Modules,” “Payment Modules,” “Other Modules,” and “Themes.”
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nopCommerce Extensions
nopCommerce is a free, customizable cart platform that uses Microsoft’s ASP.NET. It features a library of extensions, which are developed by its community. Categories include “Languages,” “Payment Modules,” “Shipping Modules,” “Templates and Themes.”
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AgoraCart Marketplace
AgoraCart, a cart for Perl developers, offers template designs for easier setup. Its marketplace offers add-on modules, buttonsets, templates, tech support, and more. Both free and paid, modules include extensions for content management, shipping, payment gateway, and product enhancement.
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Spree Commerce Extensions
Spree Commerce is an open source platform powered by the Ruby on Rails framework. Spree is free. There is a charge for merchant accounts and hosting for users who choose those services. Spree has an active community and hosts a library of over one hundred third-party extensions.
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UberCart Contributions
UberCart is designed to be used with Drupal CMS, ideal for stores selling premium content, paid downloads and other digital goods to a large community. It has a library of over five hundred community contributions, such as modules and theme templates. You can find additional modules and themes to enhance your site in the contributed project directory at Drupal.org.
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WordPress Plugins
There are over sixteen thousand plugins for WordPress, the open source platform powered by PHP and MySQL. Use the plugin directory to transform a blog into a customized store. Sort the plugins by relevance, release date, or popularity. WordPress is free; plugins are both free and paid.