Neo Geo

GnGeo
An open source emulator for GP2X and Linux.
http://gngeo.berlios.de/

NeoCD/SDL
An open source emulator for BeOS, Linux, and Windows using SDL.
http://www.geocities.com/neocdsdl/

NeoPocott
Freeware Neo Geo Pocket emulator for Acorn RISC OS, BeOS/x86, Dreamcast, DOS, Linux/i386, Linux/SDL/i386, MacOS, PocketPC ARM and MIPS, Win32, Win32/SDL.
http://neopocott.emuunlim.com/

NeoPop
An open source Neo Geo Pocket emulator for Windows.
http://neopop.emuxhaven.net/

NeoRaine
Open source Neo Geo CD emulator for Linux and Windows.
http://www.rainemu.com/html/download/neoraine.html