WOK has released a free pitch shifter effect plug-in for Windows, SimpShi.
Here's what they have to say about SimpShi:
SimpShi is a simple, free pitch shifter plugin, low on CPU.
t is the result of some testing and experimenting, so don’t expect high quality results.
It is meant mainly for non-percussive material.
SimpShi is available now as a free download for Windows.