Good news, Blackwell Bundle is released for the Mac now on GOG.com, Click on the links mentioned here, create an account using the signup in the top bar on the GOG.com website and buy the game. You automatically get when creating an account 9 free GOG games added to your account (most of them also native for Mac so no port required) so you have nothing to loose, only to receive!
In the Blackwell Legacy, you are introduced to Rosangela as she meets Joey Mallone for the first time and is called upon to investigate a series of mysterious suicides at a local university. An enigmatic killer and a string of seemingly unconnected accidents set the background for Blackwell Unbound. Blackwell Convergence will have you investigating a film premiere that hides a bloody past and–last but not least!–in Blackwell Deception you’ll investigate why the customers of various street psychics seem to die under very mysterious circumstances.