These are not modules but you may want to take a look at wellenreiter written in Perl/Gtk, wlandetect and gkismet also written in Perl/Gtk. Since you have not specified an OS you are using I linked to what I knew about.
Idea is to have a master node on a network that can poll a bunch of WiFi access points and get logs off them of who wandered past them... Don't know if this is do-able but it's what I'd like to be able to do.