http://www.plogue.com/products/alterego
Alter/Ego is based on the award winning technology featured in chipspeech but instead of targeting Vintage voice technology, it focuses on more ‘modern’ (1990+) singing synthesis algorithms and research.
It is specially tailored for musical needs – simply type in your lyrics, and then play on your MIDI keyboard. It’s a true synthesizer, the sound can be extensively modified for easy and expressive performances.
And more importantly it is FREE!
Voice banks come in various styles and licenses. Daisy is the first bank available and is also FREE.