The Quilcom Multiplier 2 is a free quadruple chorus and pitch-shift vst effects unit. The 4 stereo effects blocks are identical. Each block provides an optional input state variable static filter with adjustable cut-off frequency and resonance. This is followed by an optional chromatic pitch shifter that allows you to select musical intervals for the pitch-shift (with a fine tune setting).
Erzatz is a free VST somewhere between a vocoder and a pitch shifter, Ersatz is a simple effect splitting the signal up to 32 bands and re-generate it as a sinus stack.
FreeFall is a free hybrid delay effect and pitch shifter VST Plugin.
Pitchproof – Pitch Shifter | Harmonizer is an audio plug-in that can shift the pitch of the input. The effect is meant to combine old styles of pitch shifting with the quality you expect from modern plug-ins. The result is this pitch “pedal” simulation that has most of what is great about guitar harmonizer pedals, and still preserves the signal’s integrity.