STonX Homepage
Computers, Emulators, Atari, ST - STonX. An open source emulator for Unix/X.
https://stonx.sourceforge.net/
Hatari
Hatari is an Atari ST emulator for Linux and other systems that are supported by the SDL library.
https://hatari.sourceforge.net/
Steem Engine
The Steem Engine is a free Atari STE emulator made with ease of use in mind.
http://steem.atari.st/