IBM Bluemix Services: Watson‘s Text to Speech

Text to Speech

Synthesizes natural-sounding speech from text.

The Text to Speech service processes text and natural language to generate synthesized audio output complete with appropriate cadence and intonation. It is available in several voices, including the US English one used by Watson in the 2011 Jeopardy match.

http://www.ibm.com/smarterplanet/us/en/ibmwatson/developercloud/text-to-speech.html