GSnap - With GSnap you can get an auto-tune effect.
FluidSynth - FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has...
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
ZynAddSubFX - ZynAddSubFX is an open source software synthesizer for Linux, Mac OS X and Microsoft Windows.
CrispyTuner - Fully featured vocal tuning suite.
VirtualMIDISynth - VirtualMIDISynth is a software MIDI synthesizer implemented as a Windows multimedia user driver...