Moore Design - 990.94KB - Бесплатно (Freeware)
It's an alarm clock for your PC, with a total of eight alarms--one for each day of the week, as well as an additional one-time alarm for use at any time. You can use the built-in sound (very obnoxious) or you can even have it play MP3s.
The program is easy to understand that doesn’t let you personalize a display message when an alarm triggers, so Alarm Clock's simple greeting of "Hello" has to suffice. If you need a no-nonsense alarm clock for your PC, this program provides a nice wake-up call.

MicroInvention - 19MB - Бесплатно (Freeware)
Vector Clock is a fully scalable desktop alarm clock that can be placed anywhere on your screen, rotated with total freedom, resized to any scale and set in 3D perspective view without losing any quality. Clocks nicely integrates with desktop. Choose to pin the clock to desktop, use it as a normal window, keep it on top or even force it to foreground (when in click-through mode).

Vector Clock is customizable. There are detailed Clock Options in the settings. It also nicely integrates with Your desktop - You can choose to pin the clock to desktop, use it as a normal window, keep it on top or even force it to foreground (when in click-through mode). Plus some other options, such as "hide on mouse over", "start with Windows" and "clock transparency" configuration. 

NesterSoft - 3.03MB - Бесплатно (Freeware)
TimeLeft is a countdown, reminder, clock, alarm clock, tray clock, stopwatch, timer, sticker, auction watch, web countdown, working days countdown and time synchronization utility. Besides, it can alert you at a specific moment or run periodically, remind you before a specified event or keep on reminding you after it. The reminder can show message, play music, open a link or document, or shut down your PC.

Key features:

  • Reminder is the most powerful TimeLeft tool that lets you schedule any events: from the simplest one-time events to recurring events with complex rules.
  • Trayclock can replace your Windows' built-in system-tray clock with skinnable TimeLeft clock.
  • Clock displays time in different time zones.
  • Countdown tracks the amount of time till (or passed after) the specified event.
  • Stopwatch measures time interval.
  • Timer measures time interval and and get signal on its end.
  • Sticker displays a sticky note on your desktop.
  • Countdown For Web allows you place a countdown to your web-page using Export to Web module.
  • Floating Windows - every instance of countdown, clock, stopwatch, timer and sticker is a separate fully customizable floating window.

Comfort Software - 2.5MB - Бесплатно (Freeware)
Free Alarm Clock allows you to set as many alarms as you want. You can set one-time alarms or repeating alarms - activate only from Monday through Friday and give you a chance to sleep on the weekends. Alarms that you set will sound even if computer goes to sleep. 

Besides, the alarm clock can remind you about important events by playing your favorite music and showing a notification message. You can set alarm volume level to a comfortable level depending on the time of the day. Free Alarm Clock will let you do it. Sleep, suspend, hibernation and standby means the same thing. This feature is PC dependent and only possible for PCs that can go to sleep mode.