The 3.0.2 version of Mac2Speech for Mac is provided as a free download on our website. This Mac download was scanned by our built-in antivirus and was rated as malware free. The software lies within System Tools, more precisely Automation.
From the developer:
Mac2Speech is a speech synthesis server for OS X and macOS Sierra, allowing you to use your Mac as a text-to-speech server, converting text strings into MP3 voice sound files on the fly. A web user-interface allows for rapid testing and experimentation with different languages and voices.
You may want to check out more software for Mac, such as Bulldog, spotfinder or Launch!, which might be related to Mac2Speech.