The OpenFOAM distribution comes with paraFoam, a reader module for OpenFOAM data for the open source visualization application ParaView.

ParaView uses the Visualisation Toolkit (VTK) as its data processing and rendering engine and can therefore read any data in VTK format. OpenFOAM includes the foamToVTK utility to convert data from its native format to VTK format, which means that any VTK-based graphics tools can be used to post-process OpenFOAM cases.

The user therefore has the choice of using the reader module or data converter. Further details about ParaView can be found at http://www.paraview.org