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phpBB is a popular free and open source forum system written in the PHP programming language; the name "phpBB" is an abbreviation of "PHP Bulletin board".

Invision Power Board (abbreviated IPB or IP.Board) is an Internet forum software produced by Invision Power Services, Inc. Written in PHP and primarily using MySQL (other database engines are available), it is comparable to other forum software.

While Invision Power Board is a commercially sold product, there is a large modding community and many of these modifications are free. In addition, many groups offer the download or design of free and paid-for skins.