Chameleon Clock is a digital desktop clock which provides an attractive and useful alternative for the Windows system tray clock. Its appearance can be easily changed using standard, widely available Winamp skins or bitmaps. It also includes MP3/WAV/Audio CD alarms, birthdays, precise atomic clock, calendar, time zones, countdown, and other time tools.

AlfaMini
AlfaMini is full featured desktop clock, countdown and stop-watch

SNV Timer
Multi-task and highly customizable Alarm & Timer program. If you are tired of typing numbers then this reminder is for you.

Atomic Alarm Clock
Alert yourself about important events with different alarms and replace your standard tray clock using different skins. Alarm clock that will play a WAV file. It also can run a program, log off, reboot, shut down, or power off. Nice Alarm Clock!

Sticky Memo Note & Reminder Software
Replace real note taking with software note taking. With this drag and drop memo note software, you no longer need post it notes. In addition to a memo note program, each of these virtual post its has a settable alarm clock for reminder software.

Weather Clock
This is a weather and clock program that sits in your system tray and keeps you posted of current weather conditions, forecasts and more.