There isn't an anime for Vocaloid, and there wasn't one based off it. Although there is a rumor that there with be a fanime. (anime made by fans)
But one of the songs became popular enough to be an anime OVA. It's called black rock shooter by Ryo and Supercell. The character was created by Huke. You can look more into this on wikipedia.
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Well I don't know about Black Rock Shooter but Vocaloid doesn't have any anime based on it. Although there are rumors floating around that they are making one.
so far there is no vocaloid anime nor do they have plans to make one...it would be like a Japanese glee except vocaloid would actually be good!
Vocaloid is not an anime because, well, vocaloid is a program made in Japan where you buy the characters and the sets and you can make your own videos. Sometimes they're fan-made and other times they're made by the actual people. So, to answer your question, Vocaloid is a program, not an anime or manga. Vocaloid isn't an anime, but they have made a manga of it. It's called Hatsune Mix, and you can read it on onemanga.com.
Dude, the so-called Miku Vocaloid isn't an anime! It's a voice synthesizer.
rin kagamine isn't really from an anime.she is from vocaloid