Invision Community
Invision Community (previously known as IPB, IPS, Invision Power Suite, IP.Board or IP Board) is an Internet forum software produced by Invision Power Services, Inc. It is written in PHP and primarily uses MySQL as a database management system, although support for other database engines is available. While Invision Community is a commercially sold product, there is a large modding community and some of these modifications are free. In addition, many groups offer the download or design of free and paid skins.