jetLag 1.3 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. We recommend checking the downloaded files with any free antivirus. This Mac app was originally produced by Yasyf Mohamedali. JetLag for Mac lies within Lifestyle Tools, more precisely Travel.
From the developer:
jetLag gives you a super simple way of applying a myriad of complex algorithms which have been mathematically determined to guarantee you the optimal sleep plan.
Features: Trip timezone Information Optimal sleep plan calculation Export results to iCal/Google Calendar/Outlook Adjusts calculations based on your normal bedtime
You may want to check out more software for Mac, such as Tempus Irae, GMapCreator or Cortex Command b23, which might be related to jetLag.