Hatari is described as 'Atari ST/STE/TT/Falcon emulator for GNU/Linux, BSD, Mac OS X, Windows and other systems which are supported by the SDL library' and is a Game Emulator in the gaming software category. There are more than 10 alternatives to Hatari for a variety of platforms, including Mac, Windows, Linux, Web-based and BSD apps. The best Hatari alternative is CLK, which is both free and Open Source. Other great apps like Hatari are PCE, Hataroid, Stella and ProSystem.
A latency-hating emulator of: the Acorn Electron, BBC Micro and Archimedes, Amstrad CPC, Apple II/II+/IIe and early Macintosh, Atari 2600 and ST, ColecoVision, Enterprise 64/128, Commodore Vic-20 and Amiga, MSX 1/2, Oric 1/Atmos, early PC compatibles, Sinclair ZX80/81 and ZX Spectrum.
Stella is a multi-platform Atari 2600 VCS emulator released under the GNU General Public License (GPL). Stella was originally developed for Linux by Bradford W. Mott, and is currently maintained by Stephen Anthony.
The ProSystem Emulator is an Atari 7800 emulator for the PC and Windows OS. The emulator was written in C++ using the Windows API and DirectX. It emulates the Atari 7800 NTSC and PAL TV standards.
Z26 is one of the best emulators for the Atari 2600. The author reports that the graphics part of the emulator is nearing perfection to a point that there's little more to fix.
Javatari is a multiplayer Atari 2600 emulator written in pure Java with no external libs. Just open it! Needs Java 6 or greater and Atari ROMs.
Steem is an open source Atari STE emulator for Windows and Linux. It runs almost every ST program ever made without any problems. Steem is designed to be easy to use and has many unique features. Whether you want to run great old games, use MIDI apps just like you did on the ST...
This is the the Macintosh OSX Port of David Firth's Fantastic Atari 800 Emulator. Ported is the SDL version of the Atrari800 emulator to Mac OSX, and added a full native Cocoa interface, including Preferences, Menus, File Associations, Help and more.
ARAnyM is a software virtual machine designed and developed for running 32-bit Atari ST/TT/Falcon operating systems and TOS/GEM applications on any kind of hardware.
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Stella emulates the Atari 2600, a game console. Hatari emulates only the Atari ST, a computer series. Like a PC and a Playstation. Not an alternative at all.