Emulator links

VirtualGameboy

Gameboy-Emulator for win, Mac, DOS, Amiga, BeOS, Acorn, OS/2 and various unixes (X and console)
- unfortunately, only binaries..

Ardi-Soft Executor

This commercial (demo can be DLed) Apple Emulator emulates MacOS System 6.0.7.
No Apple Software needed to run it.

Spectemu

48k ZX Spectrum emulator for Unix (comes with source)
Here are some Programs for it.

UAE

Amiga Emulator for Unix (comes with source)
- you will need Amiga BootROM images to use this!

basiliskII

Emulates a Mac Classic or a Mac II - you need ROM images and MacOS for that!
Comes with source, binaries for Linux, BeOS, Amiga and Windows available.

Mame

Arcade emulator, source avail.

NEStra

NES emulator for Unix, source avail.

VICE

Commodore emulator (C64, C128, VIC20, PETs, CBM-II) for Unix, DOS, Win, OS/2, RiscOS
Source available.

vmac

MacPlus emulator for Unix, DOS, Windows, OS/2.
Source availble.

mace

This one emulates MacOS, i.e. you don't need any ROMs or MacOS from Apple.
Still in the development phase. Will be provided under the LGPL.