A Windows Graphical User Interface to visualize the output of MODFLOW, MT3DMS, and PHT3D models. It is a C++ application which utilises the MS Visual Studio 2015 (v14), Standard template library, Windows template library (v10.9163), Boost template library (v1.70.0), and VTK library (v8.2). For compilation, the VTK library should be installed and the Include directory and the Library directory of the project should be modified for the VTK library. The compiled Windows executable is located under the Release directory and the Example directory contains the test model shown below.