What are some alternatives?
When comparing PTgui and PhotoStitch, you can also consider the following products
Hugin - Hugin is an easy to use cross-platform panoramic imaging toolchain based on Panorama Tools.
Microsoft Image Composite Editor - Microsoft Image Composite Editor is an advanced panoramic image stitcher.
AutoPano - Autopano is the most spectacular breakthrough in automated picture stitching in recent years.
Stitch Panorama - Stich Panorama is a plug-in for the GNU Image Manipulation Program (GIMP) which takes digital...
PTStitcherNG - Fast Panorama Stitcher and Blender, implemented in SIMD-Math.
AutoStitch Panorama - Autostitch takes a step forward in panoramic image stitching by automatically recognising matching...