JN Soundboard - An open-source hotkey soundboard program
Soundplant - Play sound files with the computer keyboard
Jingle Palette - Jingle Palette application was designed to be an instant jingle player for radio broadcast studios.
Soundboard Studio - Soundboard Studio lets you take your podcast, live show, gig or performance to the next level.
Show Cue System - Show Cue Systems
qwertyGO! - With qwertyGO! you are able to trigger sounds and songs with your computer-keyboard or midi-device.