Are there any open-source web applications that will take a user's CalDAV credentials and display a nice calendar in the browser, showing the user's free/busy calendar?
Our mail/calendar server supports making our user's free/busy calendars (that's their calendars with the event names, descriptions, and attendees obfuscated for privacy -- only the start & end time of the events is shown). So we can make the free/busy schedule publicly accessible on a CalDAV URL. But, unfortunately, our webmail doesn't have a way to display the free/busy schedule on a public URL without authentication.
I'm looking for just a simple web server that I can throw in a DMZ and configure it to display a calendar with our users's free/busy schedules (via CalDAV). The URL to the web server should not require a username/password to access, so I can just write it on a business card for people to find when I'm free to schedule a meeting.