XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
Smart Sloth - Smart Sloth uses the concept of timeboxing, which is to allocate a set amount of time to each task, therefore, creating a deadline which can increase the productivity of the user.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
ChirpyTime - ChirpyTime: Timer / Alarm Clock / Clock app for iPhone / iPod Touch
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.