Raspberry Pi

The Raspberry Pi is a cheap, credit-card sized computer. The official website uses phpBB for their discussion forums.

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.

Open Cart Forums

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

Pixelmator

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

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.

KDE

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

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