Clematis 
https://codeberg.org/oppenlab/gempub
The application/gpub+zip media type ("gempub" or "GPUB") is a proposed new e-book file format that uses the ".gpub" file extension.
It is primarily intended to serve as a container for e-books containing text files of in the "text/gemini" format, allowing the author to avoid the complexity of using web technologies for e-books that do not require them. It has a secondary purpose of functioning as an archival format for Gemini capsules.
