Advertisement Auto-tune Pro 9 Free Download (QUICK)

Antares (the developer) does not offer a "forever free" version, but you can get it legally for a limited time:

A simpler, user-friendly tool for quick vocal tuning.

"Free" downloads for expensive software are common fronts for adware, spyware, and trojans .

You can download a fully functional trial of Auto-Tune Unlimited from the official website.