Free Credit Card Processing Software

What is a good, simple point of sale software?
I’m starting up a small business; I will be making sales over the phone of a single product. And, I need a very basic point of sale system. Essentially I need the program to do a few things:
Process credit cards, take down customer information (i.e. name, billing/shipping address), account for taxes, and print invoices (maybe also print labels).
Obviously, if there is a free program that does this, it would be great, but otherwise I’m willing to consider any suggestions.
Thanks to everyone ahead of time!
http://positron-pos.com/ – They also offer a free trial -
http://www.pointofsaleplus.com/ – You can download a sample
www.IBM.com/retail
http://quickbooks.intuit.com/product/accounting-software/retail-pos-solutions/point-of-sale-software.jsp
The quickbooks should be better for you if your business is small. There are so many other out there.
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