Shopping cart software with wide community. Documentation, forums, community-powered plugins. [Commercial, Opensource]

A user-friendly PHP-based shopping cart system. [Open source, GPL]

Script to setup paid membership on a site with PayPal/Clickbank support. [Commercial, trial version]

Application includes credit card processing, template-based design, and compatibility with mySQL, MS SQL, and Interbase. Online order.

PCI compliant shopping cart. Comes with number of shipping and payment modules, B2B functionality. Was originally built from osCommerce. [Commercial, Opensource GPL]

A template-driven customizable PHP shopping cart utilizing MySQL or PostgreSQL. Interfaces with numerous payment, tax, and freight methods. [Shareware]

Freeware shopping cart system. Contributions, documentation, community forums. [Opensource, GPL]

A free online shop which includes a modular system, easy management, featured items, and searching.

Fully customizable domain registration system utilizing the eNom reseller API with integrated payment gateways. Requires MySQL.

An online store which features a product catalog, shopping cart, orders and administration page. Databases are flat text files and its can edit them through web browser or off-line in a text editor. [Commercial]