GUIs for OpenFOAM:
Commercial: Symscape Beta CAE Icon CASTNet (http://www.dhcae-tools.com/) http://www.ods-engineering.com/blendme
OpenSource: EnGrid http://www.discretizer.org/
Text based: http://openfoamwiki.net/index.php/Constrib_pyfoamcasebuilder#pyFoamAPoMaFoX.py_.E2.80.93_A_text_interface