CalendarX - Get a calendar your audience can follow
Google Calendar - Spend less time managing your day & more time enjoying it
Teamup Calendar - Cloud-based calendaring using capability URL, application developed in Zurich, Switzerland.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Microsoft Hotmail - Collaborative Calendars
Rainlendar - Rainlendar - Customizable desktop calendar