Soundplant - Play sound files with the computer keyboard
Cue Player - Cue Player software for theater sound and lighting
CasterSoundboard - A soundboard for hot-keying and playing back sounds. (For podcasting)
Linux Show Player - Sound player designed for stage productions
JN Soundboard - An open-source hotkey soundboard program
Trigger Audio and Video Playback - Audio and video cue player for broadcast and live performance.