Linux Show Player - Sound player designed for stage productions
CasterSoundboard - A soundboard for hot-keying and playing back sounds. (For podcasting)
Cue Player - Cue Player software for theater sound and lighting
Jingle Palette - Jingle Palette application was designed to be an instant jingle player for radio broadcast studios.
QLab - QLab, Live show control for Mac OS X.
Sound Show - Sound Show is a soundboard application that you can utilize for your project and customize according to requirements.