Multi_Hardware

Ace - A freeware emulator for Windows dedicated to Capcom system. Sources are also available.
CottAGE - Java emulator based on the MAME sourcecode. Download and possibility to play online.
E++ - A portable object-oriented emulator - Emulates Space Invaders, Phoenix, Centipede and the home computer Sinclair ZX Spectrum (aka Timex-Sinclair 2000).
HiVE : High Velocity Emulator - A Win32 program which emulates classic arcade games such as Galaga and PacMan.
JEmu - Java based emulator that can play games online.
Kawaks - A freeware emulator for Windows. Emulates Neo Geo and CPS 1/2 Systems.
Nebula - A freeware NeoGeo and CPS1/2 emulator for Windows. [English/Spanish]
Official Raine Page - Raine is an emulator, it emulates some M68000 and M68020 arcade games and is mainly focused on Taito and Jaleco games hardware.
Shark - An arcade game emulator for the Win95/98 operating system.
VAntAGE - Vertical Antiquated Arcade Game Emulator - Written to be as small and fast as possible (to keep the cost of the host PC to a minimum) and to run the arcade games 'as intended'.