Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Digital Clock 4 - Beautiful customizable clock with plugins
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.
Gnome Clocks - Clock application designed for GNOME 3
KTeaTime - KTeaTime is a handy timer for steeping tea. No longer will you have to guess at how long it takes for your tea to be ready. Simply select the type of tea you have, and it will alert you when the tea is ready to drink.