Melodyne is the king of pitch correction on single and polyphonic sources but its price is enough to make people look for alternatives. Enter Waves Tune. This is an incredibly useful and flexible pitch correction plugin. It features formant correction and other very useful tools. The editing window is a bit small but once you get used to it, correcting vocals is a breeze. Highly recommended plugin.
Editing vocals becomes fun with this plugin.
I use this to pitch-correct my vocals, and I don't try to hide it. I know I don't have the pitch I want, and this plugin can correct that without it sounding too artificial, and sometimes giving my voice a cool formant-shifting effect.
Would recommend to anyone who doesn't feeling going all the way with Melodyne, but still wants to have fun working with their vocals.