FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Google Calendar - Spend less time managing your day & more time enjoying it
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere
FreeBu - Smart free/busy calendar sharing and meeting organizer.
Clean Google Calendar - Makes Google Calendar look nicer & launches as a desktop app