The Sylvia Project Multi Atari console emulator for PC, Mac, Playstation and Dreamcast. http://www.atariland.com/members/cfowler/index.html

AtariAge: Beginner's Guide to Emulation Answers common Atari console emulation questions. http://www.atariage.com/common/emu_intro.html

Holme's Atari 8-bit Games Includes emulators and ROMs for 2600, 5200, 7800, and Lynx platforms. http://homepages.paradise.net.nz/atari/

Yabause An open source emulator for Linux, MacOS X, and Windows. http://sourceforge.net/projects/yabause/