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.
Password Manager, Auto Form Filler, Random Password Generator & Secure Digital Wallet App.
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.
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.
KDE is mainly known for producing the KDE Desktop Environment (used in Kubuntu) for Linux.