Frodo - Frodo is a robust Commodore 64 Emulator for the Macintosh.
Stella - Stella is a multi-platform Atari 2600 VCS emulator released under the GNU General Public License...
VICE - Bring loops to life with the loop slicer plugin for Mac and Windows.
WinUAE - WinUAE is a Windows port of the emulator UAE.
C64 Forever - C64 Forever is a revolutionary Commodore 64 emulator, preservation and support package.
jGameBase - jGameBase is a fully-featured retro-gaming emulator frontend and game database utility.