Pitchometry

Highly recommended if you are looking for a good sounding pitch shift effect with zero latency.

I was searching for a decent latency free pitch shift VST for years. It's not too hard to find one with a good sound, but they always come with latency up to 200 ms. The best one I've found still has ~40 ms. Still too much for live recordings.

The ones I've found without latency had a very unnatural sound, especially at higher pitch rates. (+/- 1 octave)

The only exception is Eventide's Octavox, which earns the second place imo, since it has a "Live Mode" where it's latency free, and it sounds pretty good. At least in not too extreme situations.

But pitching down the low b string of my 7-string electric guitar by 1 octave is too much for it. The sound "flutters".

Pitchometry can handle this situation quite well.

There's a demo version available on their site. It's fully functional, there's just a noise coming from time to time. (in a very fair frequency by the way - not every 10 seconds like in some other plugins where it's hard to focus on the sound properly)

I highly recommend to check it out. The price-performance ratio is excellent.