Photomatix Pro
Photomatix is the most popular and widely used (and also my favorite). It can create stunning results if used properly. You can get a full featured trial version here http://www.hdrsoft.com/download.html or it can be also bought there.
Use the code “HDRSHOOTER” for a 15% discount.
And for your inspiration, here are few images where I used Photomatix
