Can't find an affiliate plugin

Hi,

I am looking for an affiliate plugin which will give me the names of the users who are the affiliates and the user names of the people they referred. I’m not too concerned with the amount of visitors they bring but want a plugin which shows me the user names of the actual people they referred.

I can’t seem to find one that does that. I don’t care if its free or paid but free would be preferred.

Thanks!