All of the functionality in Graphics`PlotField3D` has been added to the built-in Mathematica kernel.
Load VectorFieldPlots` to use the Vector Field Plots Package:
Version 5.2
<<VectorFieldPlots`;VectorFieldPlot3D contains the functionality of PlotVectorField3D:
Version 5.2
VectorFieldPlot3D[{x, y, z}, {x, 0, 1}, {y, 0, 1}, {z, 0, 1}]ListVectorFieldPlot3D contains the functionality of ListPlotVectorField3D:
Version 5.2
ListVectorFieldPlot3D[Flatten[Table[{{x, y, z}, {x, y, z}}, {x, 0, 1, 0.2}, {y, 0, 1, 0.2}, {z, 0, 1, 0.2}], 2]]GradientFieldPlot3D contains the functionality of PlotGradientField3D:
Version 5.2
GradientFieldPlot3D[x ^ 2 + y ^ 2 - z ^ 2, {x, 0, 1}, {y, 0, 1}, {z, 0, 1}]