Free Assistive Technology Supports for Text-To-Speech
Firefox Browser Add-Ons:
FoxVox (Windows) https://addons.mozilla.org/en-US/firefox/addon/foxvox/
SpeechUtil (Windows) https://addons.mozilla.org/en-US/firefox/addon/speechutil/
SpeakingFox (MacOS) https://addons.mozilla.org/en-US/firefox/addon/speakingfox/
TTS for Linux (Linux) https://addons.mozilla.org/en-US/firefox/addon/tts-for-linux/
Chrome Browser Add-Ons
Speak It https://chrome.google.com/webstore/detail/pgeolalilifpodheeocdmbhehgnkkbak?hc=search&hcp=main
Balabolka: http://www.cross-plus-a.com/balabolka.htm
WordTalk (for Microsoft Word): http://www.wordtalk.org.uk/Home/
MITS Freedom Stick http://mits.cenmi.org/Resources/MITSFreedomStick.aspx