Alarmy - World's most annoying alarm app
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.
Wake N Shake Alarm Clock - Wake up with a jolt of energy ready to get shit done.
Sleep as Android - Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking up from deep sleep is unpleasant, it makes you tired and it may negatively affect your productivity during the whole day.
Wakefy - Turn your Mac into a Spotify alarm clock.
Galarm - Social alarm clock and reminders