MoneyAlarm - u/moneyalarm:
ClocX - ClocX - freeware analog clock for Windows desktop with many features like calendar, alarms, skins, antialiasing and transparency.
Insane Alarm - Wakes you up no matter what! Features - obscenely loud blaring emergency alarm sound.
LClock - Longhorn systray clock program
Digital Clock 4 - Beautiful customizable clock with plugins
DS Clock - Keep your time synchronized with Atomic Time servers, using customizable digital desktop clock with westminster chimes.