NationStates

Inspired by Max Berry's book, Jennifer Government, NationStates is one of the most popular online simulation games. The forum boasts over 5 million posts and 200,000 users.

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.

VideoLAN

The VideoLAN project produces the extremely popular VLC media player software. Their forums provide support for users of the software as well as the development community.

GameServers

GameServers is a premier Game Hosting company, having collaborations with big names such as Infinity Ward, Treyarch and Epic Studios.

KDE

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

Pixelmator

Pixelmator is a popular commercial image editing software for Mac OS X users.

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