Open Cart Forums

OpenCart is popular, powerful, and easy to use shopping cart software. Their healthy community forums are powered by phpBB.

CitiesXL 2011

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

Joomla Forums

Joomla is one of the leading open-source Content Management Systems. With a userbase of over 400,000, they use phpBB as a reliable platform for support.

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.

KDE

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

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.

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