Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
YAPA-2 - YAPA-2 is a minimalistic desktop timer app for Pomodoro Technique users.
TIMEBOX - An advanced timer for professional meeting facilitators
YAPA - Pomodoro timer
Online Alarm Kur - Free online alarm clock, set alarm easily on your computer using the internet alarm clock without downloading any software, wake up in time with the loud online alarm clock.
Alarm Clock Tab - Web based time tools including alarms, timers, stopwatch, and time zone converter. Resources also include Tabata, Pomodoro and other useful tips and tactics for managing time and time tracking.