Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Talalarmo - Minimalistic android alarm
wnr - Better than pomodoro, this timer app balances work and rest.
Digital Clock 4 - Beautiful customizable clock with plugins
Date Reminder - Date Reminder reminds you of recurring or nonrecurring events, like birthdays, bills to pay...
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.