Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Time Buddy - Time Buddy brings a colorful world clock.
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
Time Zones Converter - Time Zones Converter is an application which as the name implies, is used for converting time zones.
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
World Clock - World Clock is an app that lets you see the time of any city in the world.