Macphun Luminar - Update
Macphuns excellent Luminar software has just received a major free update. They have added what they call an 'Accent AI Filter' that is designed to analyse and enhance photos at the touch of a button (or slide of an amount slider)
I tried it out on a landscape image from Yosemite.
Luminar has done a pretty good job of analysing the image and lifting out the shadows and details in the sky as well as adding saturation and punch to the foliage.