GSnap - With GSnap you can get an auto-tune effect.
MadMapper - The Mapping Software
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
Resolume - Resolume is an application for live video performances.
LinuxSampler - LinuxSampler - free, open source pure software audio sampler with professional grade features.
Linux Show Player - Sound player designed for stage productions