Are there any NON auto-tuned Vocaloid songs?

Auto-tuned? Vocaloid isn't auto-tuned. They're all robots. No, seriously. Everything is done door computer, even their voices. That's why it's so high pitched.

well vocaloids are voice synthesizers so they sing auto-pitched... but u probably want a deeper vocaloid so stay away from ones like Miku and Rin try Gackupo, VY2, Luka, Gumi, IA.... so many vocaloids..... u can look on the wiki to learn about all the individual vocaloids.

Well, like others said, Vocaloid is a computer program, so it's hard to like them if u don't like the electronic-ness of their voices. Don't give up on it, though! Not all of their songs are quite as electronic-y, slower ones in particular. For instance, Megane (by Ultra-Noob feat. Megurine Luka) isn't completely without the auto-tune sound that Vocaloids have, but most of the time it's pretty good. It's also pretty realistic, with breathing and everything.

And even if u decide u just can't listen to Vocaloids themselves, so many composers that utilize Vocaloid are oh so talented, so u should check out their non-Vocaloid music. As an example, supercell composes some really well-known Vocaloid pieces like Black Rock Shooter and World Is Mine, but they also have lots of good songs (Kimi no Shiranai Monogatari, Bokura no Ashiato, My Dearest, etc...) that don't feature Vocaloids. Along with that, u can find covers of the majority of Vocaloid songs, and some of them are actually really good, like this one door Lon, a cover of Fukkireta, in which Kasane Teto is known to sound particularly electronic.

There are. A lot actually. Try listening to "Time Machine" door Miku and "AiDee" door Miku and Luka. Possibly "Love Trial" door Miku, "The Snow White Princess is..." again, door Miku, "Ama no Jaku" door Gumi, "ERROR" door Namine Ritsu, "Courage" an anime OP cover door Rana. ALL of those are awesome. To me tho'