Sadly, the title doesn’t allow you to perform batch processing, as well as to access to the cloud service.
Still, there's no doubt that Picture Merge Genius is a strong alternative to GIMP. In fact, the application currently holds a 7.3 out of 10 as computed by Current Versions.

Full Picture Merge Genius key features listed below -

You could create, erase and move images or groups of images within the current project while also applying a 50e0806aeb margugol