I am often asked about software to be used in creating HDR images on PCs.  I recently tried out a few and though this is not the place for me to foist my personal opinion of which is the best in my opinion I can say that the few I tried out were;

Photomatix – Probably the most well known application can be found at http://www.hdrsoft.com/. A Demo version can be downloaded to try out.

FDR Tools – Can be found at http://fdrtools.com/front_e.php.  A free version is available but the more fully functioned version is shareware.

DPHDR is available at http://www.mediachance.com/hdri/version4.htm

And the last one i have tried is Oloneo which can be obtained here; http://www.oloneo.com/

If you want some tips on HDR or just to see some great examples of what can be done, you might be interested in www.stuckincustoms.com .