KDE

KDE is mainly known for producing the KDE Desktop Environment (used in Kubuntu) for Linux.

Zend Forums

Zend Technologies is one of the largest and most popular companies producing a wide variety of tools and frameworks for PHP. Their community forums rely on phpBB.

South Park Studios

Discussion forum for the massively popular American animated sitcom. Powered by phpBB.

OpenOffice.org

OpenOffice.org offers a free and fully-featured office suite which meets the needs of the common consumer all the way up to large enterprises.

Forex Station

Professional online broker and trading community.

xkcd

Discussion board for the massively popular xkcd web comic. Covering everything from Maths and Science to Logic Puzzles and Forum Games. Over 100k members and 2.4 Million posts.

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