(Not Boring) Timer - (Not Boring) Timer, a fascinating time tracking application that will let you stay on top of your task and remind you about the important events coming up on the same day.
Chronograph.io - Cloud synchronized stopwatches and timers.
Gestimer - For those little reminders during the day
Horo - The best free timer app for Mac
TIMEBOX - An advanced timer for professional meeting facilitators
wnr - Better than pomodoro, this timer app balances work and rest.