phpMyDirectory is a professional, full-featured tool to create a fast, secure, and user-friendly business directory (Yellow Pages). It is self-administered and supports unlimited categories, trade leads with pictures and descriptions, banners and logos, paid memberships, ratings, maps, and many other features. It includes a full- featured administrative solution. Users can be charged for paid memberships using PayPal IPN or the Authorize.net AIM feature.
Keyword Market Value Analyzer is a tool that allows you to compile a database of keywords, based on a particular keyword subject, and compare their real market values. The analyzer compares the number of times a keyword is searched for with the amount advertisers are willing to pay to advertise for the keyword. The result is a really good idea about how much money-making potential there is for that particular keyword.