TIMEBOX - An advanced timer for professional meeting facilitators
Intervally - Interval Timer - Sport & Health
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.
MetaClock.com - MetaClock is an Online Alarm Clock that can play YouTube videos and uploaded MP3s as an alarm tune. It supports Chromecast which means you can turn your TV or stereo system into an alarm clock. No installation is needed, it can also work offline.
Love HIIT - Free exercise timer, share your workouts