WebCalendar: Impressive list of features, development work on Sourceforge
Chronos: GPL licensed and Perl
Citadel: GPL, written in C, full groupware suite with some AJAX features
Monket: mostly CC licensed, PHP, AJAX.
Zimbra: Java, AJAX -- MPL-derivative license
Hula: AJAX email and calendar -- GPL license
WebiCal: A Web application to view and edit multiple iCalendars -- GPL license
Closed source, free:
CalendarHub: AJAX, RSS, Web 2.0, SMS, Import & Export, multiple personal calendars, calendar sharing & publishing
Kiko: SMS, Instant Messenger, PDA, offline and pure HTML versions, iCal, whatever Outlook uses, AJAX, Web 2.0, Tagging, RSS (These guys are also developing open-source Javascript ActiveRecord?, a JS implementation of Rail's ActiveRecord?.)
Planzo: AJAX, RSS, Web 2.0, XML, SMS
Scalix: AJAX, email and calendar
Closed source, non-free:
CalendarScript: Simple to use, extensible web calendar. Perl, so it works on all server platforms.
Connect Daily: "Connect Daily is an industrial strength calendar system that also supports AJAX."
Joyent: E-mail, calendars, contacts, file sharing, and shared applications. "Simple, powerful, web-based software for small teams."
Trumba: "Trumba's mission is to connect people and communities through the events they share."
Other / unknown:
Spongecell
30 Boxes
AirSet
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