The 1.0 version of ImageFuser for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application is included in Design & Photo Tools. The most popular versions of the tool are 1.0 and 0.7. This free Mac application is an intellectual property of Harry van der Wolf. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
ImageFuser is a Mac OS X program that fuses multiple exposures of one scene into an image with greater detail and well balanced exposure by using the well exposed areas of the original multi-exposure images. ImageFuser is a graphical frontend for the open source command line tools Enfuse and Align_Image_Stack. Next to these tools Phil Harvey's ExifTool is used to copy EXIF, JIFF, TIFF, IPTC, GPS, ICC profile data etc. to the new images.
You may want to check out more software for Mac, such as Morph Age, Photo Mechanic or MozoDojo, which might be similar to ImageFuser.