Lightning Calendar - Organize your life — it’s about time!
Dudle - Dudle is an online scheduling application, which is free and open source.
Google Calendar - Spend less time managing your day & more time enjoying it
FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Framadate - Make your polls