What's wrong with Netatalk?Depends how keen you are to try and compile my code.
As for transferring files: You have a Duo Dock - therefore you have SCSI (for external SCSI drives - like a ZIP for example, and a matching parallel or USB ZIP for a PC) and a floppy drive - the Mac can read PC-formatted floppies. If you download compressed files on the PC and put the compressed file on a floppy, then uncompress them on the Mac, you should be fine.