Magento

My customer would like a subscription/donation type page where their users have the option to submit one-time contributions or recurring contributions that would be charged to their credit card monthly. Does Magento have that capability?

Not in Magento itself, but through a payment solution such as WorldPay.

You might find some helpful information here:

http://www.magentocommerce.com/boards/viewthread/10655/

http://www.magentocommerce.com/boards/viewthread/10673/