gems/plugins for affiliate system? [closed]

Question

Do you remember any gems/plugins out there to support an affiliate (referral, partner) like system?

e.g the 37signals affiliate program

Any help/links would be appreciated.

Answer 1

http://code.google.com/p/substruct/wiki/HelpAffiliates

Is an open-source Rails e-commerce CMS that apparently supports an affiliate program out of the box. I'm considering it for an upcoming project, however I have no experience with it yet.