Kin Calendar - The simple and connected calendar
Meetingbird for Gmail - View your calendar and schedule meetings right from Gmail
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.
Calendly for Chrome - Schedule meetings without leaving your inbox
Teamweek - A project management software to help you get the best overview. Plan fast, change plans faster!