Windows Alarms & Clock is described as 'A combination of alarm clock, world clock, timer, and stopwatch. Set alarms and reminders, check times around the world, and time your activities, including laps and splits'. There are more than 25 alternatives to Windows Alarms & Clock for a variety of platforms, including Windows, Linux, Android, Mac and iPhone. The best alternative is Free Alarm Clock, which is free. Other great apps like Windows Alarms & Clock are Gnome Clocks (Free, Open Source), Free Countdown Timer (Free), Digital Clock 4 (Free, Open Source) and SnapTimer (Free, Open Source).
All the timers I tested were too complex for my taste. I decided to write one that was dead simple, so you could run it, type in a time and hit enter. The aim of SnapTimer is to get out of the way and help you be productive.
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.
XNote Stopwatch is a versatile and flexible multifunctional digital stopwatch / countdown timer / clock software for PC. Helpful for timekeepers at sport competitions, time tracking of work, or even as a metronome.