Blogging platform built with PHP, designed with maximum customizability, speed and ease of use in mind. Forums and bugs reports can be found at http://www.lifetype.net/
VirtueMart is an Open Source eCommerce Solution for Joomla! The other carts claim to be easy to use. VirtueMart is not only as easy to use as Joomla!, but it was easy to install and looks very easy to comprehend and maintain.
Axenna Enterprise is an intuitive, modular Content Management System (CMS) that includes intranet functionality and an online Web Office. Installs on any webserver that runs PHP and MySql.