Daphne
An open source Laserdisc emulator for Linux, MacOS X, and Windows 2000/XP.
Galaxian Emulator
A Galaxian hardware emulator. Runs on DOS, Windows 95 and Linux.
Laser - Little Arcade System Emulator Releases
An open source 8080 hardware emulator for DOS, Linux/SDL, and Windows.
Sideway
A freeware Midway8080 emulator (Seawolf, Boothill, Gunfight, Space invaders...) for DOS.
SIEmu
An open source 8080a emulator for Linux, MacOS X, and Windows.
Spaders Arcade Emulator
A classic arcade game emulator, emulating 8 games so far. These games include: Space Invaders, Space Invaders Deluxe, Space Attack II, LunarRescue, Galaxy Wars, Super Earth Invasion, Invaders Revenge and Destination Earth.
System 16 Emulator
An open source 680x0 using systems emulator for DOS and Windows.
The Cinematronics Emulator
Emulates Cinematronics games under DOS and Windows 95.