If anyone has heard the song 'still alive' from the game portal (google it) then you know what a cool song that is. I am doing a performance of it and need some software to distort in real time the singers voice so that it sounds like the original song. What is some software that can do this for me?

I'm not familiar with the song so I don't know exactly the sound you are after but Guitar Multi FX might be worth a try for your real-time distortion effect.