What vocal techniques are used here?

[taldt33]

Is it a post-processed human voice, with what kind of plugin? Or something vocaloid like?

https://www.youtube.com/watch?v=kSMNLlCpUxQ

Thanks for your answers

[bitman]

Harmonizer low interval snuck just under lead or a ring mod.

[chk071]

Reminds me off the game Portal.

[Aloysius]

Autotune

[taldt33]

Do you know any vst to achieve these technique?
Thanks

[taldt33]

If somebody has informations?Thanks in advance

[thecontrolcentre]

Something like MHarmonizer ... or possibly the singer is really good at harmonies.

[SoundPorn]

This is VocalSynth2