As someone who refuses to use Adobe products and also has a Mac, I can tell you that there are multiple apps in the Apple app store that will stitch photos together. I can't recommend one because a long time ago I bought a Canon point and shoot and a stitching program that works really well came with the camera's software. Although I have long since upgraded to a DSLR, I still use that old stitching program.
Nevertheless, I just checked and there are multiple stitching apps in the app store. Good luck!