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.
OpenCart is popular, powerful, and easy to use shopping cart software. Their healthy community forums are powered by phpBB.
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.
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.