Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Clocker - Keep track of people in different time zones
MeetNotes - Increase Productivity with Meeting Notes Tool. More effective minutes, Prepare Agenda, Collaborative Notes & Action Items.
World Clock iOS 8 Widget - Check the time, anytime. Just pull down Notification Center.
Chili Piper - Chili Piper is an intelligent calendar for Sales teams, to book their own meetings or set appointments for other teams.
Dato - Better menu bar clock with calendar and time zones