Haven Automation Simulation
Haven Automation Ltd. based in Swansea, UK manufactures and distributes a range of calibration equipment from portable temperature, pressure and electrical instruments to complete calibration workshops. Haven also offers efficient calibration services and repair in UKAS-accredited laboratories.
http://www.haven.co.uk/

Nuclear Power Plant Simulation
Nuclear Power Plant Simulator Game made with Flash by Geoffrey Noles
http://www.ae4rv.com/games/nuke.htm

SIM-SERV
SIM-SERV is the world's first virtual center for simulation. SIM-SERV's mission is to help industry to increase efficiency and productivity by leveraging on the modern simulation technology. SIM-SERV provides unbiased leading edge information of simulation technology, solution and suppliers. SIM-SERV offers feasibility studies, helps manufacturer with project scope definition and tendering procedure, searches the best-suited supplier and oversees the project until successful conclusion. SIM-SERV service is operated by VTT Technical Research Centre of Finland, SimulationsDienstleistungsZentrum GmbH from Germany and City University in London. The SIM-SERV network currently has around 20 technology suppliers across Europe.
http://www.sim-serv.com/index.php

ACIMS -- Arizona Center of Integrated Modeling & Simulation
Artificial Intelligence and Simulation Group. The page contains summaries of ACIMS simulation projects, simulation links, and news. One of the main research projects is the Discrete Event Specification Formalism (DEVS).
http://www.acims.arizona.edu/

Averill M. Law and Associates
Averill M. Law & Associates offers simulation consulting, simulation training, and the ExpertFit distribution-fitting software. It was founded in 1977.
http://www.averill-law.com/

Tau Simulation
Tau Simulation produces high performance simulation software for integrated circuit verification
http://www.tausim.com/

CADwalk
Process simulation, device simulation, and circuit simulation as services. Specialties include working with SiGe HEMT, HBT, and MOSFET.
http://www.cadwalk.de/

C++SIM
_your description goes here_
http://cxxsim.ncl.ac.uk/

Vicinities.com -
The Simulation Zone Users Forum has been created for individuals to effectively share simulation knowledge and information online. It contains links to important simulation sites.
http://www.communityzero.com/simzone/

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