Php Net is an easy to use eCommunity for your site.
PHP Net is a light-weight flexible PHP forum package that uses object-oriented programming and the MySQL database. Its purpose is to act as a fast (and free) alternative to other forum packages which are noticably slow or have everything but the kitchen sink.

-Fast and secure with Execution times averaging 0.2* seconds.
-Automated installer script for easy set up.
-Unlimited categories and forums, all with configurable permissions.
-Full Administrator Control Panel for managing the forum and its users.
-Full support for output skinning.
-Default image set looks clean on all background colors (no white edges).
-Board index collapses to forum view when there in only one forum, meaning less overhead.
* Execution time was calculated on a 400Mhz Pentium 2 Box with 320mb SDRAM under Windows NT 5.0. you can free download phpnet 4.0 Final now.