The NDL package implements the Danks Equilibra (read the paper here) for the Rescorla Wagner model of learning (read about the RW model here).
See NEWS for a list of recent changes to the package.
The original paper that describes this model (and which you should use as a citation when reporting ndl models):
Baayen, R. H., Milin, P., Filipovic Durdevic, D., Hendrix, P. and Marelli, M. (2011), An amorphous model for morphological processing in visual comprehension based on naive discriminative learning. Psychological Review 118, 438-482.
can be downloaded from here