Antares offers a of Auto-Tune Pro. You get every feature listed above.
subscriber or signing up for a new subscription, you can often get 3 months of Auto-Tune Unlimited for free Best Free Alternatives auto tune pro gratis
No Updates: You will miss out on essential bug fixes and compatibility updates for new operating systems. Antares offers a of Auto-Tune Pro
There is no free plugin that does this. The closest free option is Melodyne Essential (not free, but cheaper) or ReaTune (free with Reaper DAW). auto tune pro gratis