While we have a $5/month option, Wikispaces has offered a free service (no ads, same features as paid service, no strings) for K-12 teachers since early 2006.

While we have a $5/month option, Wikispaces has offered a free service (no ads, same features as paid service, no strings) for K-12 teachers since early 2006. We've given away around 225K wikis under this plan. http://www.wikispaces.com/site/for/teachers http://www.wikispaces.com/site/for/teachers