Do you want to create your own forum? here is the best way for that !
phpBB is a popular internet forum package written in the PHP programming language started by James Atkinson. The name “phpBB” is an abbreviation of PHP Bulletin Board. It is available under the GNU General Public License and its free. Its configuration is also very simple.
Some of phpBB’s strengths are:
* A templated style system intended to allow easy customisation.
* Support for internationalization; 64 translations are available as of 2006. 
* Compatibility with multiple database management systems.
* A large community of users providing free support and customisations.