Professional online broker and trading community.
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.
GameServers is a premier Game Hosting company, having collaborations with big names such as Infinity Ward, Treyarch and Epic Studios.
KDE is mainly known for producing the KDE Desktop Environment (used in Kubuntu) for Linux.
Gentoo Linux is an open source operating system built on top of the Linux kernel and based on the Portage package management system.
Pixelmator is a popular commercial image editing software for Mac OS X users.