On your browser, go to Google and find GVST – GSnap. When you open the website, you can see the information Step 2. Go to Downloads, it is located on the upper part of the web page. Click that and it will redirect you to the Step 3. How To Use Auto Tune With Audacity On Mac. Open your Audacity and record your audio or import a prerecorded sound to auto-tune. Select the part of the audio you want to correct and click the Effect Menu. Look for the GVST GSnap plugin and the commands for adjustment will appear.

Background
Having received several queries about Mac versions over the years, I had a go at crowd-sourcing some funds to fast-track a Mac-porting project some months ago. That was unsuccessful, sadly.
However, off the back of that I was given a battered old MacBook by a nice mathematician at the University of Bath. So, I've been playing with that a little in my spare time to see what I can do. With some extra RAM from eBay, I managed to drag it as far as OSX 10.8 (Mountain Lion) and start compiling some code.
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In the interest of creating better multi-platform code, I decided to look at Linux at the same time. So I grabbed Ubuntu Studio 14.04, installed it on an old USB stick and started developing on there too.
Update 2020, year of Covid

Gvst Gsnap Autotune Mac
The Mac and Linux versions have matured a little now - see the main plugin pages for downloads.