This is a concise listing of current projects underway for Linux/m68k. Let me know if your project isn't listed so I can add it.
I have marked the ones that haven't had any recent activity with ? (these may revert to unclaimed status if I don't eventually get mail from someone saying that they are being done).
A port of the Generalized Graphics Interface (a kernel-level I/O abstraction) to Linux/m68k: Geert Uytterhoeven <Geert.Uytterhoeven@cs.kuleuven.ac.be>. (This project seems to have been abandoned in favor of Geert's abstract console scheme.)
Atari TOS emulation: The OSIS Project.
AmigaOS emulation: The Amiga Replacement OS project.
Linux/m68k-specific edition of Linux Installation and Getting Started: Chris Lawrence <firstname.lastname@example.org>.
(Unclaimed) MacOS emulator (based on Shapeshifter, perhaps?)