Conquer Club

Conquer Club is an online multiplayer world domination game. The discussion forum is host to over 500,000 members and 2.8 million posts.

CitiesXL 2011

Developed by Focus Home Interactive, Cities XL 2011 is a city simulation game. Their community forums are powered by phpBB.

Mozillazine

Hugely popular Mozilla community providing support for Firefox, Thunderbird, Seamonkey and other well known Mozilla products. Over 350k members and 4 Million posts.

Debian

Official Support Forum for Debian, the kernel-based open source operating system. phpBB provides a solid platform for support and discussion.

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.

Gentoo

Gentoo Linux is an open source operating system built on top of the Linux kernel and based on the Portage package management system.

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