Antares free VST plugin

Auto-Tune VST is a precision tool for correcting intonation and timing errors or creatively modifying the intonation or rhythmic articulation of a performance.

Auto-Tune EFX 2 is the quickest, easiest-to-use tool for real-time pitch correction and creating the iconic Auto-Tune Vocal Effect.

Harmony Engine Evo RTAS can be used as a real-time plug-in or from the AudioSuite menu and is indicated for Pro Tools LE and M-Powered systems.

PC Autotune is a program that automates certain key tuning processes for a Windows based computer.