At present, there are two possibilities for visualization of results:
OOFEM provides a simple way to export the results in VTK
format, allowing to use VTK based visualization tools (such as MayaVi or ParaView) for postprocessing on different platforms. Consult input manual
on how to export data to vtk.
OOFEG - X-windows based post-processor. It requires X-windows libraries to be installed on the system, so it is more or less limited to unix platforms. Follow installation instructions
on how to install and configure oofeg. The oofeg HOWTO
describes its usage.