Emvoice is also a contender in this market.

But I think Synthesizer V is really the one to watch. The reason is because they're applying machine learning to tuning the vocals. Here's an example they posted of a song that was automatically tuned:



Although it's still synthetic, I think it's much better than anything that I've heard up to this point. This will be first available for the Japanese voices later next year, with support for other languages to follow.

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?