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.

Queen Online

As the official board for the world-famous band Queen, this community hosts a wide variety of discussions by Queen fans from around the globe.

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.

CitiesXL 2011

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

Avant Browser

Avant Browser is a fast and user friendly browser which uses Microsoft's Trident rendering engine. The browser has been downloaded over 22 million times.

Ars Technica

Boasting almost 14 million posts, Ars Technica is one of the biggest and oldest technical forums still operating today. They use phpBB to power their forums and comment system.

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