OpenFOAM simulations 2D and 3D

http://sites.google.com/site/engcalculusev/openfoam-examples

Fluid Simulation for Video Games

http://software.intel.com/en-us/articles/fluid-simulation-for-video-games-part-1/

GNUPLOT

GnuPlot is a Free Open Source software for Plotting 2D/3D graphs.

More information on gnuplot is available on : http://t16web.lanl.gov/Kawano/gnuplot/intro/basic-e.html

Dutch OpenFOAM User Group (DOUG)

Dutch OpenFOAM user group(DOUG) these are a bunch of enthusiastic members who use OpenFOAM to carry out CFD simulations and have formed a team which handles different domains of fluid flow which includes Combustion ,Magneto Hydrodynamics,multiphase flows and marine applications.
Any one can join this 'Special interest group (SIG)' and get your self equipped with their seminars and various other updates/activities on OpenFOAM.

For more information : http://www.dutchopenfoamusers.nl

Commercial use of OpenFOAM

Given below are some of the companies which use OpenFOAM for providing cfd solutions to their customers.Check out these companies to see the application of openfoam in various fields. 

ICE Stroemungsforschung - http://www.ice-sf.at/

Icon - http://www.iconcfd.com/

CFD+ engineering - http://www.cfd-ing.eu/en/index.php

engys - http://engys.eu/

CFD support - http://cfdsupport.eu/

move-csc - http://www.move-csc.de/en/