Virginia Web Designers: Joomla, Drupal, Open-Source, CSS, and PHP Northern Virginia / Maryland / Washington DC web designers

Take a look at nBill, CB Subs (from joomlapolis.com),  and JoomSuite Member.

nBill is the most robust one, and features extensive payment gateway support, robust data import/export, etc.

CB Subs is also good, but I think is a bit harder to use, though handy if you want to give customers a “My Bills” tab in their profile. CB Subs is useful mainly for member subscriptions but can also be used for one-off payments.

JoomSuite Member is aimed mainly at member subscriptions and may not suit all uses. It does integrate nicely with other JoomSuite components, which are more user-friendly than CB Subs or nBill.

nBill and JS Member both require IonCube loaders to be loaded into php.ini.