Causal and Statistical Reasoning: Software and information for exploring perceptions of causality.
COGENT: A graphical environment for cognitive modeling. Free for the moment, and available for PC and Unix. Developed by Rick Cooper, John Fox and others.
Life Science Associates: Publisher of psychology software offering programs for cognitive rehabilitation.
MLPest, PsychoFit, etc.: Free software (Win/Mac) for analyzing psychophyisical data. By Lewis O. Harvey, Jr.
Psychophysics Toolbox: Software allows the use of Matlab to do vision research.
TarrLab Stimuli: Collections of pictures of familiar and novel objects, faces and geons.
VIAT: A Windows program for demonstrating visual-attention phenomena (freeware)