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, MCL6809

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).

Cycle accurate Mega Drive emulator

Complete package of AmiBlitz3 including all sources.

FreeBee - AT&T 3B1 / 7300 UNIX PC emulator

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.

NeXTROM

Multi-system, pure JavaScript (& a little AssemblyScript) emulator, with great accuracy and speed. Currently some SNES, NES, GameBoy, Master System, ZX Spectrum, and GameGear support

Sega Mega Drive/Sega Genesis emulator that emphasises portability.

Historical source code and documents related to Ambermoon, the role-playing game developed by Thalion Software GmbH, and published for the Commodore Amiga in 1993.

volksFORTH is a 16bit Forth System maintained by the German Forth Gesellschaft e.V.

Sound driver for Sega Mega Drive

rom hack for Arcade mame mess sfc snes sega md neogeo romhacking

A short casual adventure game for the Sega Genesis written in 68000 assembly

NeXTSrc

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