Debian

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

Solia Online

Solia Online is one of the most active online communities with over 18 million posts. Solia Online allows you to create your own avatar, buy items, and discuss topics with your friends.

Pixelmator

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

Adblock Plus

Adblock Plus is one of the most popular Firefox Add-ons in the world, with over 10 Million daily users and over 100k downloads a day. They use phpBB to offer support to their users.

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.

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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