Didn't 3.5+ have zip support built in to the OS?
Zip disks (amiga RDB formatted) pops ut by them selves. Bootable zips, just works...
FAT formatted zips need a dos driver. I initially had trouble getting it to work. But got some dos drivers from "A4000_mad" and they works just fine.
The only problem with os older than 3.5 is to format disks. 3.5 and 3.9 have zip tools by default. (if i am not mistaken, and if I'm not completely mistaken they are written by iomega themselves.)
Zip tools are available at
Aminet