Surprised no one has mentioned Pitch n' Time yet. Incredibly versatile, 3 algorithms for maximum flexibility, and features that allow the pitch to follow the time graph (varispeed) and a A/B time matching window a la Vocalign.

Although already mentioned, I love Pitch n' Time. Incredibly versatile, 3 algorithms for maximum flexibility, and features that allow the pitch to follow the time graph (varispeed) and a A/B time matching window a la Vocalign.