Download of FaceAlert 2.0.17 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. FaceAlert for Mac lies within Security Tools, more precisely Mac protection.
The actual developer of this free Mac application is Shore Think, LLC. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
FaceAlert is a non-intrusive, background app that silently uses your camera to watch for someone standing over your shoulder. When someone appears behind you while working on your computer, FaceAlert displays the face of the person behind you in a notification window.
You may want to check out more Mac applications, such as Marvin's AMD Utility, HenWen or SecuriSSH, which might be similar to FaceAlert.