It is the Italian Community for Ubuntu, a popular open source community operating system based upon the the Debian Linux Distribution.
Professional online broker and trading community.
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.
Gentoo Linux is an open source operating system built on top of the Linux kernel and based on the Portage package management system.
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.
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.