Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Power Alarm Clock - Free - Powerful alarm android app to manage even the most complex requirements.
Digital Clock 4 - Beautiful customizable clock with plugins
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.
Alarm Clock (applet) - Alarm Clock is a fully-featured alarm clock for your GNOME panel or equivalent.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.