What is phpBB?
phpBB is a high powered, fully scalable, and highly customisable open-source bulletin board package. phpBB has a user-friendly interface, simple and straightforward administration panel, and helpful FAQ. Based on the powerful PHP server language and your choice of MySQL, MS-SQL, PostgreSQL or Access/ODBC database servers, phpBB is the ideal free community solution for all web sites.

Key Features
Supports popular database servers
Unlimited forums and posts
Multiple language interface
Private or public forums
Powerful search utility
Private messaging system
Complete customisation with templates
See the complete feature list...