Galarm - Social alarm clock and reminders
Clocker - Keep track of people in different time zones
Alarmy - World's most annoying alarm app
Dato - Better menu bar clock with calendar and time zones
Alarm Clock Xtreme - Alarm Clock Xtreme: Alarm, Stopwatch, Timer (Free) is the most popular alarm clock app created and published by AVG Labs for both iOS and Android devices.
Clock mini - Simple clock app in the Dock