Hey,
I get a lot of returning visitors after they converted to my landing page and I would like to send them to another offer when they do. Is there a way to do this in
This would be negative retargeting of sorts and will have to rely on cookies or quite specific logging of identifying info like IP + user-agent + ISP etc. so that you get the same user.
The simplest way would be to drop a cookie when users convert (would need JS code on thank you page) and check for that cookie using PHP on the landing page, and if exists then show another lander or change a link.
This won't be that simple to implement and to the best of my knowledge isn't a feature of any of the typical click tracking systems.

It's not the tracking software that makes this difficult.
The product you're promoting need to allow you to put a piece of code on their thank you page.
And that's the difficult part 
Building on Zeno's idea, this is how I would see it play out with cake and
1 - Configure multiple offers in the lander section of
2 - Page that accepts the offerID (#oid#) as a parameter in the query, then drops a cookie to the user with this stored as a value.
3 - In cake "Tracking and conversion", use an x-domain iframe request to display this page with #oid# as part of the link. P3P and browser privacy rules going to cause issues here potentially.
4 - Javascript at the top of our lander checks for the cookie, then checks the iod against a predefined list. Select an alternative offer, then link out with trackvoluum.com/click/2 etc as required.