Hatari: An Atari ST/STE/TT/Falcon Emulator

Hatari is an Atari ST/STE/TT/Falcon emulator for GNU/Linux, BSD, Mac OS X, Windows and other systems which are supported by the SDL library. Hatari also features the possibility to “mount” a directory of the host system as a ST drive, or to use images from an original Atari’s hard disk. Hatari needs a fast machine (1 GHz or more for ST/STE emulation, > 2 GHz for Falcon emulation) which is running a POSIX compatible operating system (preferably GNU/Linux) that supports the SDL library.

Source: hatari.tuxfamily.org