VICE - Bring loops to life with the loop slicer plugin for Mac and Windows.
Stella - Stella is a multi-platform Atari 2600 VCS emulator released under the GNU General Public License...
GameBase - bu22.com - the home of the GameBase frontend and databases.
jGameBase - jGameBase is a fully-featured retro-gaming emulator frontend and game database utility.
C64 Forever - C64 Forever is a revolutionary Commodore 64 emulator, preservation and support package.
Steem Engine - Steem is an open source Atari STE emulator for Windows and Linux.