You can program all the tasks for a single day (like a doctor's appointment), weekly (trainings, gym, etc.) or even annually (like birthdays). Each one of them with their own personalized sound, which you can choose from an ample gallery.
The application also allows you to wake up your computer to the time you choose to, as long as it is hibernating and not completely off, meaning you can even use it as an alarm clock.
Aida Organizer is a very complete and easy to use diary. It obviously doesn't have hundreds of options, but it does have just enough.
30 day trial version.