Stella is on of the best emulator of Atari 2600 game console, running on many
different systems, such as Linux, Solaris, Windows, MacOS/X, WinCE, OS/2, GP2X.
It has been written initially by Bradford Mott, see Stella site for details.
Here is a port on Dingoo/Dingux of the version i've previously ported to GP2X-Wiz
Many new features have been added compared to original Stella version,
have a look to the README for details.
It's available on my blog