Hi,
Having recently taken a few panoramic photos, using the panorama assist on my camera, I needed some new software to stitch the images together. I used to use a website,
https://www.dermandar.com/create/ but as it uses Adobe Flash, my modern browsers now block it. A bit of searching found Hugin,
http://hugin.sourceforge.net/, available for Windows and Mac for free.
It's easy enough to use and has some tailorable options. It can't fix somethings though, see my test image below ;)
Worth playing with.