KEGS is an actively-developed Apple IIgs emulator, originally written for HP workstations, improved and customized for Linux. It runs under X at any display depth, and supports changable memory sizes, joysticks, and sound. KEGS boots all Apple II OS variants, and supports all of the graphics modes of the Apple IIgs. It requires a copy of the Apple II system ROMs. Kegs has been adapted to work under Mac OS X, Windows, and the SDL library.
Atari800 is an Atari 8-bit computer (400, 800, and XL and XE series) and Atari 5200 game system emulator for DOS, Windows, Amiga, Atari ST, Mac, and Linux/UNIX. It includes support for Atari cartridge ROMs, popular Atari disk images files, running Atari binaries directly from the host system, and accessing the host filesystem from within the emulated Atari.