T-Clock Redux - T-Clock Redux in an enhanced fork of Stoic Joker's T-Clock 2010 with ISO week number support...
TClock Light - TClock allows you to modify the clock on the taskbar in Windows.
DS Clock - Keep your time synchronized with Atomic Time servers, using customizable digital desktop clock with westminster chimes.
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.
LClock - Longhorn systray clock program
TClockEx - This program claims to enhance and customize the Windows standard digital display, but it gets an F for aesthetics. TClockEx's tabbed, no-frills interface