Zerene Stacker - Zerene Stacker is “focus stacking” software designed specifically for challenging macro subjects and discerning photographers. Of course it works great with simpler subjects, close-ups, and landscapes also!
PTgui - PTGui is panoramic stitching software.
Helicon Focus - Focus stacking software: a post-processing technique that extends the depth of field in your photographs.
Hugin - Hugin is an easy to use cross-platform panoramic imaging toolchain based on Panorama Tools.
Enblend/Enfuse - Enblend combines images that overlap into a single large image with no seams.
PanoramaStudio - PanoramaStudio can create seamless 360 degree and wide angle panoramic images.