Alarm Master is described as 'Convenient and powerful utility, that helps managing personal alarms and reminder on your Windows Mobile Classic/Professional or Android device'. There are more than 25 alternatives to Alarm Master for a variety of platforms, including Android, Windows, Mac, Linux and Online / Web-based. The best alternative is Free Alarm Clock, which is free. Other great apps like Alarm Master are Gnome Clocks (Free, Open Source), Digital Clock 4 (Free, Open Source), KAlarm (Free, Open Source) and Alarm Clock (applet) (Free, Open Source).
KAlarm is a personal alarm message, command and email scheduler. You can set up alarm messages which pop up on the screen at chosen times (with sound if desired), or you can schedule commands to be executed or emails to be sent.
Alarm Clock is a fully-featured alarm clock for your GNOME panel or equivalent. It's easy to use yet powerful with support for multiple repeatable alarms, as well as snoozing and a flexible notification system.
Alarm DJ is an online alarm clock that plays your MP3 files and YouTube videos of your choice. It supports Chromecast which means you can turn your TV or stereo system into an alarm clock. No installation needed, work right from your browser, even if you're offline.