EmuZ-2500: An open source MZ-2500 emulator for Windows by the Unofficial Nester Author Toshiya Tekada.
Mz800em: An open source MZ-800 emulator for Linux/svgalib based on Mz700em written by Russell Marks.
POEMS: An open source PC-xxxx emulator for FreeBSD and Linux. [English/Japanese]
Virtual X68000: An open source X68000 emulator for Linux.