HDRtist Pro is a streamlined Mac App thats been designed to create and edit HDR or Exposure Blended images.
Utilizing Apple technology, HDRtist Pro is able to wield and manipulate 128-Bit floating-point images (that’s 16,843,009 times more precision than a JPEG photo), into beautiful works of art or super-realistic photos. Our engine’s been designed to work with multiple exposures, single RAW images, and can make single JPEG images look like HDR. 1-Click Styles, editable HDRs, straight forward interface and the innovative drop-N-click system are all featured in HDRtist Pro.
Ohanaware offer a free trial and also a free version, HDRtist, with less features,
More Info: http://www.ohanaware.com/hdrtistpro/
