Sometimes(very often!) we need to add effects on our voice recording. To make it sound better, to make it sound thicker, or just to maker it sound incredible!
For widening/thickening, or making choir like voices, you can use : chorus, voice multiplier, voice doubler, stereo wideners.
For radical changes or special FX, you can use harmonizer / pitch changing, genre changer, pitch correction / autotune.
Here’s a top 5 of free VST effects for changing the voice :
1) Azurite multi voice chorus VST
This great chorus can work on many type of sources : guitar, voice, etc..
It works nicely for voice, it’s not too hard/harsh and does a good job on mono inputs for spreading voices and give a stereo effect.
information & download @ http://distorqueaudio.com/plugins/azurite.html
Dry voice :
Voice with chorus!