DukaPress is an open source e-commerce solution built for Wordpress.

Easily add a donation button to your site using InspirePay.com. Get paid via PayPal, Dwolla, and Credit Cards.

Payments & Invoicing plugin for WordPress to quickly and easily sell online. Create Buy Now buttons or inline checkout forms in seconds to accept online payments on your website.

EC Authorize.net is easy to use Wordpress Plugin and can be installed in just a few minutes.

Plug-in that supports sales of digital data using Paypal button

Allows configuration of cURL connection options.