Need a robot voice or free text to speech system

[=MGN=RedEagle]

Hi guys!

I am doing some videos in which a robot is featured. Anyone knows where I can find a text to speech system I could use? The audio generated would need to be royalty free.

Any other suggestions on getting a robot voice in video.

 

[=MGN=RedEagle]

I wonder if using mumble would make this work... hmm Anyone know if you are allowed to use the Mumble text to speech in an audio recording?