Clocks - A minimal world clock app for your Mac's menubar

ClocX - ClocX - freeware analog clock for Windows desktop with many features like calendar, alarms, skins, antialiasing and transparency.

144blocks - Colorful way to track your time! Inspired by Wait But Why

T-Clock Redux - T-Clock Redux in an enhanced fork of Stoic Joker's T-Clock 2010 with ISO week number support...

Clocker - Keep track of people in different time zones

Fitari Fitness Alarm Clock - The Fitness Alarm Clock will wake you up by making you stand up and do a number of fitness...