Downloading ShadowBook 1.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free software for Mac is Medallia. The software relates to System Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
The application will trigger if the left sensor value is below the threshold, and the right sensor is above. Due to what appears to be a hardware bug the right sensor cannot be used a trigger. This program can send a notification to make it switch to the next desktop
You may want to check out more Mac applications, such as iPAD, Bulldog or Script Timer, which might be similar to ShadowBook.