Is there a php shopping cart that does not need registration?

I want to find an open source php shopping cart software. Is there a software that does not need customer registration? Customers only add the items into their shopping cart then click paypal, pay the money. (I think paypal already has this function, custom e-mail address, custom can write where address, what are they want in their payment introdution.)

Solution

There are several, but I've personally used this one - works nicely.

http://www.oscommerce.com/community/contributions,355

It also supports paypal

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