http://www.dosbox.com

el fa molt fàcil de portar a diferents plataformes. DOSBOX emula també la CPU : 286/386 realmode /protected mode, Directori Filesystem /XMS/EMS, Tandy /Hercules/CGA/EGA/VGA/VESA gràfics, la SoundBlaster /Gravis Ultra Sound card per a una exel·lent compatibilitat amb programari i jocs antics… DOSBox is a DOS emulator that uses the SDL-libraries. This makes it very easy to carry to different platforms. DOSBox also emulates CPU: 286/386 realmode / protected mode, directory filesystem / XMS / EMS, Tandy / Hercules / CGA / EGA / VGA / VESA graphics, a SoundBlaster / Gravis Ultra Sound card for an excellent compatibility with older software and games ...

, Linux, MacOS X .. Platform: Windows, BeOS, Linux, MacOS X ..
LICENSE: Open Source
PRICE: Free

http://www.rastersoft.com/programas/fbzxesp.html

FBZX is a Spectrum emulator, designed to run full screen in a frame buffer console or under X-Windows.

LICENSE: GPLv3
PRICE: Free

Free engine SCUMM emulator