I would like my Smartphone to play certain sound tracks at certain hours each day (quite similar to military-style buggle calls for waking up, assembly, lunchtime and so on). But I want the device to play the sound without asking me to confirm that I have heard it. No "Dismiss" / "Snooze" / "OK" buttom. Simply the sound at the scheduled time played once and nothing more.
Which application would do it? - Preferably a GNU program. Or any other kind of free software without advertising (it seems an odd petition, but we Linux users are used to that).