I found this one [1] that I find quite well done coming close to a human-sounding voice.<p>Which is your favourite to read aloud articles you find on the web?<p>[1] https://chrome.google.com/webstore/detail/read-aloud-a-text-to-spee/hdhinadidafjejdhmfkjgnolgimiaplp
Espeak. Not much human sounding but I like it.<p><a href="http://espeak.sourceforge.net/" rel="nofollow">http://espeak.sourceforge.net/</a>