z80 topic
RunCPM
RunCPM is a multi-platform, portable, Z80 CP/M 2.2 emulator.
coffee-gb
Gameboy emulator in Java 8.
z88dk
The development kit for over a hundred z80 family machines - c compiler, assembler, linker, libraries.
millfork
Millfork: a middle-level programming language targeting 6502- and Z80-based microcomputers and home consoles
CLK
A latency-hating emulator of: the Acorn Electron and Archimedes, Amstrad CPC, Apple II/II+/IIe and early Macintosh, Atari 2600 and ST, ColecoVision, Enterprise 64/128, Commodore Vic-20 and Amiga, MSX...
collapseos
Bootstrap post-collapse technology
KnightOS
OS for z80 calculators
xemu
Emulations (running on Linux/Unix/Windows/macOS, utilizing SDL2) of some - mainly - 8 bit machines, including the Commodore LCD, Commodore 65, and the MEGA65 as well.
ngdevkit
Open source development for Neo-Geo