Timer online with alarm. Create one or multiple timers and start them in any order.
Free Visual Timer, 1 Hour Timer
How to Use Countdown Timers to boost Conversions with Examples - Adoric Blog
Efficient Classroom Management Timer
Online timer
Bar Timer
Test Drive: 5 Email Countdown Timer Tools
Clocks
Online Stopwatch
Use the Countdown timer web part - Microsoft Support
Free Countdown Timer for Windows - Download