Alarmy - World's most annoying alarm app
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Galarm - Social alarm clock and reminders
Digital Clock 4 - Beautiful customizable clock with plugins
My Own Clock - Wooden gear clocks, clock kits, and do-it-yourself clock plans. These original all-wood clocks are functional, attractive, and fun!
Talalarmo - Minimalistic android alarm