Need a good vocoder

[ATMArage]

Well, I've decided that it's time to start adding some lyrics to my music. Unfortunately, I've discovered that my voice is absolute crap :p
I desperately need a vocoder. Can anyone here recommend a good one?

[Particle]

WTF is a vocoder?

[Ailuros]

take some gurgles with sand. It might not improove, but sound closer to Tom Waits :D