T-Clock Redux - T-Clock Redux in an enhanced fork of Stoic Joker's T-Clock 2010 with ISO week number support...
TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
Free Desktop Clock - Free Desktop Clock is the advanced replacement for standard Windows tray clock.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
ClocX - ClocX - freeware analog clock for Windows desktop with many features like calendar, alarms, skins, antialiasing and transparency.
wnr - Better than pomodoro, this timer app balances work and rest.