UnInstall

In the Applications directory:

/Applications/FreeCAD.app

In the Users Home Library directory

$HOME/Library/Application Support/FreeCAD
$HOME/Library/Preferences/FreeCAD
$HOME/Library/Preferences/com.freecad.FreeCAD.plist
$HOME/Library/Preferences/freecad.plist
$HOME/Library/Caches/FreeCAD