What software should i use for vocal effects for making techno?

I hear of something called auto tune and i was wondering if there was a better software, or one that is free and is the same.

Is auto tune free?

Where can i download it?What software should i use for vocal effects for making techno?Audacity

Bing it (Bing is better than google)

pick a part

google chrome update

shedd aquarium

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