SoftWare with Auto Enhance?
I am very pleased with Photoshop Elements auto enhancing features and the one I use almost always is called Adjust Smart Fix. The good thing about this tool is that it's not fully automatic but you are presented with one slider which you can use to adjust the percentage of the auto-correction to be applied. In my opinion this is very clever because I don't think any auto algorithm can guess with any high probability how to correct each photo. With the Adjust Smart Fix tool I can often quickly correct 80-90% of photos, which I think is a very good result.
The tool analyzes the image and if necessary removes colour cast, adjusts colour balance, adjusts brightness, contrasts and levels, lifts poorly visible shadow detail, etc.
My version of Elements is 7 but I suspect the same tool should still be in the latest release.