Here is a constantly updated list of the top 10 most visited franchise directories by Alexa. 60 sites as of this date have been recognized and categorized by Alexa. Blue MauMau estimates that there are some 100 plus franchise directory websites.
These directories can help a franchise buyer have an idea of what franchise concepts exist in the market place. Interested buyers can typically complete a form to have franchisers contact them directly.
(Note: Although our brand new Blue MauMau site is not a franchise ad directory, it is ranked the seventh highest directory by traffic. ...Thanks, I think.)