Simulation Tools
A Collection of Modelling and Simulation Resources on the Internet for the simulation of both continuous-time dynamic systems and discrete-event ones. Provides a broad review with links to the software.
http://www.idsia.ch/~andrea/simtools.html

Fidelity Simulation and Training
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http://www.fidelitytech.com/simtraining.html

PARSEC
PARSEC: A C-based simulation language for sequential and parallel execution of discrete-event simulation models, developed by the UCLA Parallel Computing Laboratory. On-line technical support, manuals. Download Parsec for free.
http://pcl.cs.ucla.edu/projects/parsec/

The Breve Simulation Environment
MacOSX software for simulation of artificial life and decentralized systems.
http://www.spiderland.org/breve

Kofman, Ernesto
Universidad Nacional de Rosario. Application of DEVS in simulation and control of continuous systems; Bond graphs; Fault modelling and simulation.
http://www.fceia.unr.edu.ar/~kofman/

20-sim modeling and simulation of dynamic systems
20-sim is a state-of-the-art modeling and simulation package for dynamic systems using iconic diagrams, block diagrams, bond graphs and equation models. Download a free full-working demo now.
http://www.20sim.com/index.htm

AMESim: Modeling & Simulation Environment for Systems Engineering
IMAGINE is the world's leading supplier of multi-disciplinary system simulation software for engineers and technicians in automotive, aerospace, industry and education.
http://www.amesim.com

PLECS - Simulation of Electric Circuits in MATLAB/Simulink
PLECS is a Simulink toolbox for the fast simulation of electrical and power electronic circuits.
http://www.plexim.com

DYMOLA - Simulation tool for dynamic systems
Handles large, complex multi-domain models. Faster modeling by graphical model composition. No manual equation manipulation needed. Faster simulation - symbolic pre-processing. Open for user defined model components. Open interface to other program. 3D Animation, real-time simulation.
http://www.dynasim.se/

Advanced Simulation Systems
Fixed wing and helicopter flight simulators. Flight simulation hardware, 3D software, and resources.
http://www.advancedsimulation.com/