a question of affiliate add-on


I am looking for a good affiliate add-on for promoting my site.


there many affiliate , zen-cart affiliate add-on, snap affiliate add-on, Jrox add-on.
And there are also many affiliate Marketing websites.

are these affiliate add-ons are limited to be used with a certain affiliate marketing website?
for example, does the zen-cart affiliate add-on work with Jrox.com?
how to select, please help.