FindThatFont! is a handy and free tool that allows to preview fonts that are installed on your system and to classify them into over 30 different (editable) categories. By using this categorization you can find any font on your system faster than ever before.
It also allows you to easily compare fonts by adding them to a shortlist of favorites, search fonts by name, and create an HTML (Web page) file showing all the fonts on your system. FindThatFont! has an extension manager and allows developers to modify or extend the program with other features. Version 1 improvements in speed, threading and editable categories.