CasterSoundboard - A soundboard for hot-keying and playing back sounds. (For podcasting)
Soundplant - Play sound files with the computer keyboard
Soundboard Studio - Soundboard Studio lets you take your podcast, live show, gig or performance to the next level.
Soundpad - Play sounds in voice chats in high digital quality.
Jingle Palette - Jingle Palette application was designed to be an instant jingle player for radio broadcast studios.
EXP Soundboard - A soundboard that supports almost all MP3s and WAVs.