Mupdf ( https://mupdf.com https://mupdf.com ) also supports ePub. I personally using it with zathura for vi keybindings and theme support ( https://pwmt.org/pro

Mupdf ( https://mupdf.com https://mupdf.com ) also supports ePub. I personally using it with zathura for vi keybindings and theme support ( https://pwmt.org/projects/zathura-pdf-mupdf https://pwmt.org/projects/zathura-pdf-mupdf )