What does a script like that do?

It's a script that provides your affiliates an interface to register as an affiliate to promote your product or site, and after they have registered, they get their affiliate links e-mailed to them to start promoting your product for a said commission.

Thanks a lot. You are a great guy.

All the references above are paid stuffs. I need a free one for now.

Any more recommendations?

You have not managed to clearly describe or explain what sort of script you are after. There a literally millions of scripts floating on the internet. But if you could just take the time to describe what you want, there are very knowledgeable people here that would point you in the right direction.

Good luck