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Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Norwegian 4x4 Protocol - Download the Norwegian 4x4 App for scientifically-proven HIIT workouts. Transform your fitness with structured interval training. Available on iOS and Android.
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.
Intervally - Interval Timer - Sport & Health
KukuKlok - Kukuklok is a free alarm clock available online and offline.
Love HIIT - Free exercise timer, share your workouts