AGS Engine ports
This page gives an overview over ports of the AGS engine that make it possible to play AGS games on other platforms than Windows. There are several efforts in the making. If you want to help improving the engine by porting to another platform, refactoring, etc., please investigate first if joining one of the existing efforts makes sense before starting another port. Check the Engine Development forums for novelties.
AGS Development Version
The development version of AGS is more portable, backwards compatible and the code is being cleaned up. The engine works on Windows, Linux, Android, iOS and PSP.
Source and further information: https://github.com/adventuregamestudio/ags
sonnevelds SDL port of AGS 3.2.1 for Mac OS X
This engine was changed to use the SDL library instead of Allegro. It supports games created with AGS 3.2.
fuzzies ScummVM port
fuzzie works on a clean reimplementation of AGS in ScummVM that will be eventually portable to many platforms. It is not usable yet.
Wiki page: http://wiki.scummvm.org/index.php/AGS