PTgui is not available for Linux but there are some alternatives that runs on Linux with similar functionality. The most popular Linux alternative is 
Hugin, which is both free and Open Source. If that doesn't suit you, our users have ranked 29 alternatives to PTgui and five of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to PTgui are 
AutoPano (Paid), Stitch Panorama (Free, Open Source), 
Enblend/Enfuse (Free, Open Source) and PTStitcherNG (Free, Open Source).
PTGui is panoramic stitching software. Originally developed as a Graphical User Interface for Panorama Tools (hence the name), PTGui now is a full featured photo stitching application. If you're looking for more info about PTgui like screenshots, reviews and comments you should visit our info page about it. Below you find the best alternatives.
Hugin is an easy to use cross-platform panoramic imaging toolchain based on Panorama Tools. With Hugin you can assemble a mosaic of photographs into a complete impressive panorama, stitch any series of overlapping pictures and much more.i
Autopano is the most spectacular breakthrough in automated picture stitching in recent years. First software to automatically detect pictures belonging to a panorama, First software to perform HDR stitching, First software to really correct color and exposure variations between source images. Autopano is incredibly fast: it will take your workflow and productivity to new heights. Autopano is extremely efficient, even in the most difficult cases.
Stich Panorama is a plug-in for the GNU Image Manipulation Program (GIMP) which takes digital images and overlays one atop the other to make a panorama. With multiple applications of Stitch Panorama, any number of images can be combined into a large panorama. Features include image blending, color balance, and distortion matching. The above image was stitched together from four separate images.
Enblend combines images that overlap into a single large image with no seams. Enfuse combines images that overlap into a single image with good exposure and good focus.
Fast Panorama Stitcher and Blender, implemented in SIMD-Math. PTStitcherNG reads and transforms any number and type of input images, and combines them into one seamless panoramic image with larger field-of-view. Given enough input images, full spherical 360x180 degree views can be synthesized suitable for virtual-reality viewers or printing. Transformation parameters and names of the input images are read from a plain-text projectfile.
