SpeedReader 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 free software for Mac OS X was originally developed by Luming Yin. The software lies within Productivity Tools, more precisely Office Tools.
From the developer:
Speed Reader is an application that help you read faster. All you need to do is paste in an article you would like to read, adjust the speed reading rate and choose your favorite font, then Speed Read it with the power of silencing vocalization. To train to read faster, you must first find your base rate. Afterwords, you can adjust the predefined speed as your reading speed increases.
You may want to check out more Mac applications, such as Speed Reading or 7 Speed Reading, which might be similar to SpeedReader.