FPCE
"Free PC Engine Emulator". An old, open source emulator for DOS (PC-AT/PC-98) and PlayStation. Its source code may still prove useful to curious developers. Maintained by Bero.
Hu6280/MacOS
A discontinued emulator for the Macintosh with reasonably good compatibility. Includes a copy of the Jamanoid ROM, developed exclusively for use with Hu6280.
HuGo
An open source, XPCE-based emulator for DOS, Linux and Windows. Maintained by Zeograd.
Magic Engine
A shareware emulator for DOS, MacOS and Windows. Supports any HE System, from CoreGrafx to Arcade CD-ROM. Maintained by David and Cédric Michel.
Neco
An open source SDL using emulator for BeOS, Linux, and Windows.
PC-Ngine
A freeware, HuGo-based emulator for Dreamcast. Maintained by Emanuel Schleussinger.
RiscPCE
An old, open source emulator for RiscOS. Maintained by Paul Clifford.
TGEmu
An open source emulator for BeOS, DOS, MacOS and Windows. Maintained by Charles McDonald.
VPCE
"Virtual PC Engine". An old, freeware emulator for DOS, MacOS, RiscOS, Unix and Windows. Maintained by Jens Christian Restemeier.
XPCE
"DirectX PC Engine Emulator". An open source, FPCE-based emulator for Windows (PC-AT/PC-98). Maintained by Hmmx.