PDFSpeech 1.8 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This Mac app was originally developed by Onekerato. The program relates to Productivity Tools.
From the developer:
PDFSpeech will help you read more. It taps into text-to-speech (TTS) technology built into macOS to help you zip through PDFs. With great tools at hand, you’ll look forward to reading a book cover to cover, and even read an entire chapter in one sitting. PDFSpeech strives to banish the effort involved in reading, and it adds invaluable momentum to help you complete your biggest reading tasks.
You may want to check out more software for Mac, such as 3dissue, Blurb Tally or iTeXMac, which might be related to PDFSpeech.