JDevs, modeling and simulation software for the environment -
Software as framework for a Phd thesis on Natural complex system modeling and simulation Java environment based on Object Oriented, includes devs simulation engine, a GUI and XML models. The site also contains publication on the project.
http://spe.univ-corse.fr/filippiweb/

JiST - Java in Simulation Time -
Discrete event simulation engine that runs over a standard Java virtual machine.
http://jist.ece.cornell.edu/

Journal of Artificial Societies and Social Simulation -
An interdisciplinary journal for the exploration and understanding of social processes by means of computer simulation.
http://www.soc.surrey.ac.uk/JASSS/JASSS.html

J-Sim -
 J-Sim is a Java library for process-oriented discrete-time simulation. It uses concepts known from the Simula programming language. Freeware. Source code, documentation and examples of use available.
http://www.j-sim.zcu.cz

Kiran Consulting Group -
 Specialists in Simulation, Flow and Lean Manufacturing, Advanced Planning and Scheduling (APS), Staffing and Forecasting and Industrial Engineering solutions. The products include Computer Simulation for Lean and Flow Manufacturing
http://www.kiran.com

Lanner Group -
Specializes in simulation based planning, scheduling, and decision support software.
http://www.lanner.com/

Legovic': Ecological Modelling Links -
A useful list of liks to ecological models, documents and other simulation tools.
http://dino.wiz.uni-kassel.de/mod-info/all.html

Links to Simulation Software -
 Useful links to simulation tools, used in discrete event simulation and applications in animated battle simulations.
http://www.ultimatebattles.com/links/Simulation_Software/