Motorola 68k Dev on an Amiga

[Trev]

An m68k-elf toolchain, complete with newlib and gdb (useful only as a bare CPU simulator), should build out-of-the-box on just about any host. After that, you just need linker scripts and startup code, both of which are readily available.

[Trev]

vasm is the successor to PhxAss. Apart from being an awesome assembler, if you find something that doesn't work correctly, or if there's a feature you'd like to see, you can email Frank (the author), and he's likely to fix or augment vasm overnight. (I can't speak for his time, obviously, but Frank rocks.)

[Trev]

@commodorejohn

You can probably still get a licensed copy from Software Hut. Their web site isn't updated often, but they usually respond to email quickly and do answer the phone. Experience shows they can source just about anything within reason, usually new.