BitNami Open Atrium Stack Native Installer is an easy-to-install distribution of the Open Atrium application. It includes pre-configured, ready-to-run versions of Apache, MySQL, PHP and phpMyAdmin so users can get a Open Atrium installation up and running in minutes after answering a few questions. Windows, Linux, Linux 64, Mac OS X and Unix operating systems are supported.
Open Atrium is an open source platform designed specifically to make great teams communicate better. An intranet in a box with: a blog, a wiki, a calendar, a to do list, a shoutbox, and a dashboard to manage it all. Let's not forget that it's also completely customizable.