Yes! SophiePeel is peel-apart instant film that I make myself: the receiver sheets, the developer (goo), all from scratch. It is not Polaroid, it is not a re-release, and this is just a one-woman show.
The proper name for this process is Diffusion Transfer Printing. A sheet of Agfa x-ray film takes the exposure, a hand-coated receiver sheet becomes the photograph, and developer paste moves the silver from one to the other. This isn't like packfilm, it's an alternate photographic process that requires the use of a darkroom.
Someone who is truly interested in getting into doing this themselves can take a gander at the Photrio thread mentioned below. It's not for the faint of heart, but someone who is SERIOUSLY interested in a truly unique photographic process can find everything they need to learn how to get into it.