Open Atrium – Beautiful Drupal-Based Intranet cum do-it-yourself project
Open Atrium is an open-source, multilingual web application to create a Drupal-based Intranet, where teams and co-workers can easily collaborate.
Open Atrium is highly customizable and extensible, which means that anyone can develop new features. Add other modules and easily customize the Open Atrium interface as per their team’s requirements and do anything else that you can think up to make Open Atrium meet your exact needs.
It is built on the Drupal framework & has modules like a blog, a wiki, a calendar, a to-do list, a shoutbox, and a dashboard to manage it all. Open Atrium is easy to install; you need PHP 5.2, PHP GD extension, and MySQL 5 for the database. It also uses Apache
mod_rewrite module for creating clean URLs and supports the major standards-compliant browsers like; Firefox 2+, Safari 3+, Internet Explorer 7+.