Drupal is community drive open source web content management system (CMS). It is a powerful, flexible and customizable web applications framework as well.
Sites using this CMS from around the Waterloo Region are many, including KWLUG's own site, Engineers Without Borders (Waterloo Chapter), Cambridge LUG, internal site for The Working Centre, and many more.
It has experienced explosive growth in he last two years, and continues to improve all the time. As with all open source projects, volunteers and donations are always welcome for various aspects of the project.
The donations link can be found here.