Welcome to Professional Software Resources !
PsycSite: Software Sites has pointers to a carefully pruned list of psychology-related software available on the Net. These links are to both shareware (or freeware) and commercial softeware.  Of course: Caveat Emptor.  Especially good sites are indicated by bold face type.
PSYCHOLOGY-RELATED
COMMERCIAL SOFTWARE
 AVAILABLE ON THE INTERNET

Advanced Psychometrics Inc.
Home of the developers of Scrutiny: a program to detect test cheating.

General:  Psychology Software
Teaching software with standardized computer experiments.

General:  Health Sciences Software
Developers of easy-to-use Windows psychology software.

Educational:  Software for teachers of Psychology
Crofter Publishing presents OpRat, CCDog, Illusions Pack, etc.

Experimental:  Software for experimentation
Cedrus publishes SuperLab, experimental lab software and experiment generator in psychology and hardware like response boxes, i/o cards, and video splitters, and Clinical Planner.
 
PSYCHOLOGY-RELATED
FREEWARE AND SHAREWARE AVAILABLE ON THE INTERNET

General:  SIByl Software
A searchable database of psychology related software.

Statistical:  StatLib
A system for distributing statistical software, datasets, and information by electronic mail, FTP, gopher, and WWW.

Cognitve Science:  Cognitive Software
Cognitive and Psyc Science software archive.

Miscellaneous:  Jumbo Software
Massive but easy to use archive of all kinds of software.