Hatari 4.1.4 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within System Tools, more precisely Virtualization.
Hatari-1.3.1_macosx.zip is the common file name to indicate this program's installer. This free software for Mac OS X is a product of Hatari.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The latest version of the program is supported on Mac OS X 10.4.0 or later. The following versions: 1.6 and 1.3 are the most frequently downloaded ones by the program users.
From the developer:
Hatari is an Atari ST emulator for Linux, BSD, BeOS, Mac OS X and other systems that are supported by the SDL library. More precisely, Hatari is an adaption of the WinSTon source code to the SDL library, using the portable UAE CPU core instead of the original, non-portable assembler CPU core.
You may want to check out more Mac applications, such as MConvert, PlayOnMac or Jpcsp, which might be similar to Hatari.