Digital Camera Enhancer
Mediachance
Free Digital Camera Enhancer is free brother of the commercial automatic enhancer and batch processor DCE AutoEnhance. Free DC Enhancer does the hard job of noise reducing and automatic balance control for you.
The program works best if you have bad light condition (indoor, shadows etc..) and your image is somehow off. So if some of your images are already fine, you won't see much difference. DC Enhancer makes very delicate changes.