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Marxio Timer is a scheduler that supports up to 16 predefined actions such as turn off/restart computer, display text or play sound, run/terminate programs etc. Many options are available for configuring when actions are executed, including at selected hour, cyclically, after selected amount of time elapses, CPU usage above/below certain value etc. Marxio Timer optionally displays a countdown window, and it can be minimized to the system tray.

Note: The official program is offline and an archived copy has been posted (thanks NickR). The author has been contacted and says he has no interest in making it available in the future.