Tendenci is an open source content management system built for non-profits, associations and cause-based sites. Functionality including association management, event registration, membership management, forums, photo galleries, donations, payments, newsletters, CRM, and much more.
This site resets every hour or two. Use "admin/admin" or "user/user" to log in and look around.
"Connect and Organize the World's People"
License information (GNU GPLv3+) can be found in LICENSE