Time Buddy - Time Buddy brings a colorful world clock.
Dato - Better menu bar clock with calendar and time zones
Time Zone Converter - Time Zone Converter is an online productivity tool to calculate exact time across time zones.
Clocks - A minimal world clock app for your Mac's menubar
World Clock - World Clock is an app that lets you see the time of any city in the world.
Clocker - Keep track of people in different time zones