RetroArch is a frontend for emulators, game engines and media players.
An advanced network simulator to design and configure virtual networks
Versatile Commodore Emulator
Run Windows applications on Linux, BSD, Solaris, and Mac OS X
C64/Amiga emulator with PAL shader and runAhead
Emulator of the 8-bit computers Sharp MZ-800 / MZ-700
C64 Emulator
Z80 shared library including some nice test-projects
a multiplatform, full-featured GameBoy classic emulator
Create your own Atari tapes
Эмулятор ЭКВМ серии «Электроника»