ACT-R is a cognitive architecture: a theory about how human cognition works. On the exterior, ACT-R looks like a programming language; however, its constructs reflect assumptions about human cognition. These assumptions are based on numerous facts derived from psychology experiments.
ACT-R is released under LGPL and works with the following free lisps: CLISP, CMUCL, OpenMCL.
http://act-r.psy.cmu.edu/
Tools for simulating an interactive world external to an ACT-R model include:
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ACT-R/PM: best for conventional fine-grained simulations, PM has support for most of what you probably want. Works with MCL and ACL.
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ACT-R/SOS: best for flexible rough-grained simulations, SOS is simple and easy to learn. Works with MCL, ACL and CLISP.
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