Logsnap 1.1.1 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This Mac app is an intellectual property of Marc Teichmann. Logsnap for Mac is included in Security Tools.
From the developer:
Logsnap can detect faces in front of the iSight of your Mac and capture a snapshot. The program works as a computer protection tool that lets you see who has accessed your Mac after leaving your computer. The snapshots are saved in a directory that you determine.
You may want to check out more software for Mac, such as Padlock OS X, SecuriSSH or Tattletale, which might be related to Logsnap.