One more option:
KLON takes your voice and adds up to 16 different copies of your voice in realtime. This lays the ground for an impressive amount of applications like:
Has anyone used vocaloid to create a song based on public domain music ?
Do not forget Autotune
iVoxel
Vocalist's Doubler produces a huge new vocal effect by revisiting the very concept of the doubling process. Vocalist applies normal doubling, but then expands your sound into a 3D space so you can hear both the width and the depth of your vocal tracks. This makes your vocal sounds clearer with a strength that can stand strong in any mix. If you are looking for a big impact - and great professional sounding vocal tracks - this feature is the killer!
Features
Pricing - €80 EUR
More info - http://www.supremepiano.com/product/vocal.html
Vocaloid looks interesting. Vocalign is a major part of the vocal-chain.
Wish there were more alternatives with lining up vocal tracks. There is a plethora of vocal-tuning solutions.
iZotope Nectar 2
Features:
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