Apple App Analytics - Apple's very own iTunes Connect App Analytics
Time Buddy - Time Buddy brings a colorful world clock.
My Motiff - Allowing you to stay connected in realtime
Time Zone Converter - Time Zone Converter is an online productivity tool to calculate exact time across time zones.
Usage Analytics in appFigures - Track usage for your app along side downloads, ranks & more
World Clock - World Clock is an app that lets you see the time of any city in the world.