Freeware Emulators

Amiga:

• WinUAE [???]

Apple:

• AppleWin [GNU GPL]

Atari:

• Stella [GNU GPL]

DOS:

• DOSBox [GNU GPL]

IA-32

• Bochs IA-32 Emulator Project

Sega Master System:

• Osmose [GNU GPL]

Sega Genesis / Mega Drive

• Generator [GNU GPL]

PowerPC:

• PearPC [GNU GPL]

Sega Genesis / Sega CD / Sega 32X:

• Gens [GNU GPL]

Sega Dreamcast:

• Swirly [GNU GPL]

Sega Saturn:

• Yabause [GNU GPL]

Super Nintendo

• ZSNES [GNU GPL]

Nintendo 64

• Nintendo 64 [GNU GPL]

ZX Specrum

• Fuse [GNU GPL]

Other

• QEMU [GNU GPL/GNU LGPL/MIT/BSD]