There are 6 repositories under 68000 topic.
SGDK - A free and open development kit for the Sega Mega Drive
Ted Fried's MicroCore Labs Projects which include microsequencer-based FPGA cores and emulators for the 8088, 8086, 8051, 6502, 68000, Z80, Risc-V, and also Typewriter and EPROM Emulator projects. MCL51, MCL64, MCL65, MCL65+, MCL68, MCL86, MCL86+, MCL86jr, MCLR5, MCLZ8
Mega Drive/Genesis core written in Verilog
A language-agnostic JSON-encoded instruction-by-instruction test suite for the 8088, 68000, 65816, 65[c]02 and SPC700 that includes bus activity.
PCM Hammer & PCM Logger, tools for General Motors Powertrain Control Modules (PCMs).
Free open-source compressor for apLib with 5-7% better ratios
A collection of development tools targetting SEGA's SVP chip found in the Mega Drive/Genesis version of Virtua Racing.
volksFORTH is a 16bit Forth System maintained by the German Forth Gesellschaft e.V.
A short casual adventure game for the Sega Genesis written in 68000 assembly
Sega Mega Drive/Sega Genesis emulator that emphasises portability.
An emulator for various m68k and z80 based computers, written in Rust. Currently it has support for the Sega Genesis, TRS-80, and Computie (my own project), with Macintosh support in the works
A collection of 68k computer projects, including a unix-like operating system written in C that runs on them
Motorola 68000 assembler, clone of SN 68k (A.K.A. asm68k).
68000 assembly tutorials for Atari ST by perihelion of poSTmortem
Super fast DMA queue for the Sega Genesis
Some of the Amiga sources i´ve written in the past millenium
build a toolchain for cross developement. Supports motorola m68k-elf, avr and arm-none-eabi
Language Server Protocol implementation for Motorola 68000 assembly