Another excellent free option. MAutoPitch is ugly but brutally effective.
For the best results, use (Waves Tune RT, Auto-Tune Artist) during recording and Graph/Offline plugins (Melodyne, Auto-Tune Pro) for final polishing in the multitrack editor. autotune vst for adobe audition 15 best
The definitive pitch-correction software that started it all. Antares Auto-Tune Pro X offers the absolute industry-standard sound for both real-time correction and meticulous graphical editing. Another excellent free option