PiSCSI allows a Raspberry Pi to function as emulated SCSI devices (hard disk, CD-ROM, and others) for vintage SCSI-based computers and devices. This is a fork of the RaSCSI project by GIMONS.
Netatalk is a Free and Open Source AFP fileserver. A *NIX or BSD system running Netatalk is capable of serving many Macintosh clients simultaneously as an AppleShare file server.