Linux Show Player - Sound player designed for stage productions
Voicemod - What are the voice changers? How do these work? Are these illegal? What is a soundboard? Find all the answers here. Voicemod - The Best FREE Voice Changer
QLab - QLab, Live show control for Mac OS X.
Clownfish Voice Changer - Clownfish Voice Changer is multiple voice changing software for various chatting and gaming platforms.
Trigger Audio and Video Playback - Audio and video cue player for broadcast and live performance.
JN Soundboard - An open-source hotkey soundboard program