PhpBB is free (open source) forum software that uses PHP and MySQL. Users do not have to be online at the same time to communicate with each other. You simply leave a message on which another user can respond again. Because phpBB is free and everyone can do what it wants, there is a fanatical group of phpBB users who want to provide other help and customizations. There are several support sites that provide information, translations and help. In addition to support, styles and customizations (modifications) are also made that are available to everyone.