Open Source and History Teaching

We would be very interested to hear from any history teachers / coordinators who are using open source in one form or another to support history teaching.

Perhaps you know examples of Wordpress blogs, Moodle courses or Mediawiki content with a history focus? Audacity being used in  living history projects? Are there some other interesting aplications out there? Open source timeline software or genealogy applications being used in schools?

Whatever it is, we'd really like to hear about it, ideally as new stories, pages or case studies, or just as comments below.