PushPin
PushPin is a Web based, fully-threaded powerful forum system. There are 69 global configurable options in Pushpin as well as 14 forum level options. In addition, PushPin now has a fully integrated Banner Management system. Its combination of simple web based forms and templates makes it easy to integrate discussions into the look and feel of your existing web site. It also comes with DB/DBM support, optional .htaccess security and custom graphic support.