There is a 68k version. I have used it on my LC575! I just cannot remember what that version was, though I will have a look around some HDDs to see if I still have it around.

Also, QuadSix50 has in his sig

"- 33 MHz Apple Mac Quadra 650 (Mac OS 8.1, MacHTTP/NetPresenz FTP)"

It would appear that he also has it running on a 68k. You just have to find the right version; they are not all PPC only.