UVI Falcon - Sampler/synth hybrid instrument
Linux Show Player - Sound player designed for stage productions
Pianoteq - Pianoteq is a virtual piano that runs on your computer.
QLab - QLab, Live show control for Mac OS X.
LinuxSampler - LinuxSampler - free, open source pure software audio sampler with professional grade features.
Trigger Audio and Video Playback - Audio and video cue player for broadcast and live performance.