VisioVoice is a product for blind and vision impaired Mac users that adds
multilingual support to Apple's VoiceOver technology as well as providing a
number of other speech and vision related features to enhance access to Mac
OS X. 

Links:
AssistiveWare announces VisioVoiceŽ for Mac OS X, a multilingual companion
for VoiceOver
http://www.assistiveware.com/pr.php#PR170306