Trial software of the 2 best ones I have found.
Probably the most popular choice:
http://www.hdrsoft.com/Here is the latest software I discovered a few months ago. I actually prefer this one a lot of the time:
http://www.mediachance.com/hdri/index.htmlAn example of HDR is like this:
1 image, three exposures:



Using Photomatix and tonemapping, the result is this:

Paul.