The ACT-R distribution contains all the files needed to run ACT-R models and develop custom task environments. The Macintosh distribution includes an OS X-style application with a standard Macintosh look and feel. The Windows/Linux distribution includes a double-clickable Java archive (JAR) file that launches the application; you will need to install Java on your system if you have not already (Windows/Linux only). All distributions include an archive file for custom coding, a user's manual, and a set of ACT-R tutorial models (derived from those used in the CMU ACT-R tutorials).

• Release distribution, version 1.3:  Mac/Win/Linux

The development distribution below represents the most recent, though not necessarily stable, build of the system.

• Development distribution:  Mac | Win/Linux

The source code is also available for advanced users who are interested in modifying the cognitive architecture and/or the development environment.

• Source code, version 1.2:  Source