Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
TIMEBOX - An advanced timer for professional meeting facilitators
Days.To - Count down to holidays and events & share with friends.
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.
TickCounter - Create a countdown timer and put it on your website in 30 seconds. For free. Works great with Wordpress, Shopify, Weebly and many others.
KukuKlok - Kukuklok is a free alarm clock available online and offline.