VisioVoice

VisioVoice was the first third-party product to provide access to Mac OS X for people with vision impairments. It has served many people well for many years, but Apple has continued to improve the built-in Mac accessibility features. Sales of VisioVoice have been discontinued because macOS now offers most of the zoom features VisioVoice was originally designed for. You can find all these accessibility options in the Accessibility panel of the System Preferences. It comes free with macOS.

If you are looking for an alternative for VisioVoice's text reader functionality take a look at Wrise, which not only provides a great accessible text reader but also offers a range of accessible word processing features:
http://www.assistiveware.com/product/wrise

Find more information about Apple’s built-in Mac accessibility features

Please feel free to contact us at support@assistiveware.com if you've any questions.