The Zoomify web site, at http://www.zoomify.com, has downloads for "Zoomify Express" for the Macintosh and for Windows PCs, but it has nothing for GNU/Linux. Fran Firman, ffirman@netgate.net.nz, wrote a shell script to "zoomify" a JPEG file. I have made some simple modifications to it, cleaning it up a bit and allowing it to also handle TIFF and other image file formats. You can download it from https://www.systemeyescomputerstore.com/zoomify_image/zoomify_image.sh.