Z26 - Z26 is one of the best emulators for the Atari 2600.
Hataroid - Atari ST emulator for Android based on Hatari.
Stella - Stella is a multi-platform Atari 2600 VCS emulator released under the GNU General Public License...
jGameBase - jGameBase is a fully-featured retro-gaming emulator frontend and game database utility.
Playnite - Source code generated using layoutit.com
Hatari - Hatari is an Atari ST emulator for Linux and other systems that are supported by the SDL library.