“Omeka is a free, flexible, and open source web-publishing platform for the display of library, museum, archives, and scholarly collections and exhibitions.” Perfect for history, art, and literature courses, students can create their own digital exhibits for free on through Omeka.net with limitations, or they can install a more robust Omeka.org installation through Reclaim Hosting.
Teaching with Omeka by Jeremy Boggs at ProfHacker for The Chronicle of Higher Education