16+ At&T Natural Voices Text-To-Speech US. Check it out for yourself They are almost indistinguishable from a real human speaker.
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Natural voice text to speech reader 2.7.1.0 (freeware) by natural voice reader. Read from scanned documents or images. At&t natural voices is an award winning text to speech technology developed by at&t laboratories, and believed by many to be the most natural sounding tts available. All new advanced text to speech 3.6 (atts) is a text to speech utility based on microsoft agent technology.