Open NARS
Since 2008, NARS is developed as open source software at http://code.google.com/p/open-nars/.
NARS 4.3.2 (August 15, 2007)
This Java applet demonstrates some of the implemented NARS functionalities. You can either directly run it over the Internet, or download a zip file (smaller than 200K, containing all the NARS demo files), unzip it into a folder, then open NARS.html in the folder with a browser. No installation is needed.
To see how the applet works, it is strongly recommended to start with the user's guide. Two example files are available, one of which showing representative single inference steps, and the other representative multi-step inference processes. After trying them, you can modify them, as well as your make your own examples.
NAL 1.0 (August 24, 2004)
NAL is a Prolog program that implements all the inference rules in NAL 1-6, without memory structure and control mechanism for multiple-step inference. The source code comes with a user's guide and examples. The examples are tested with SWI-Prolog.
NAL truth-value functions (June 25, 2007)
All the NAL truth-value functions are collected in a spreadsheet file NAL-TruthFunctions.xls.
The file contains three tables showing the relations among uncertainty measurements, the truth-value functions of the one-premise rules, and the truth-value functions of the two-premise rules, respectively. In each table, the input values can be modified, and the outputs of the functions change accordingly. The system parameters used in the functions can also be adjusted.