LuminanceHDR is an excellent free software project for creating high dynamic range photographs from a collection of exposure-bracketed shots of the same scene — first it aligns your photographs using tools from the Hugin project, and then lets you choose between HDR tone-mapping algorithms to create the final image with. Here are some of my photos from the last year processed with LuminanceHDR's implementation of the Mantiuk '06 algorithm, with parameters of contrast=1.0 and saturation=1.2, all available under CC-BY-SA 3.0. (Since the thumbnails below are small, you might prefer to use this Flickr slideshow to see them up close.)
