The program "FandP" (Fields and Potentials) written for the Amiga and Microsoft Windows provides stereoscopic views of electric potentials and corresponding electric fields for configurations of 1 through 8 charges.  As with "Crystal Lattices", the views can be rotated and zoomed in real time.  This program is still not complete.
A few sample images are given below.
You will need a pair of red and blue 3D glasses to view them.

Electric Field for a Quadrupole 
Surface Plot of Potential for Same Quadrupole

You will find the program interesting if you are a science educator, or just interested in 3D animations.

If you are interested in beta testing the Window version of this software, you can download  FandP32.zip    here.  This version requires a 32 bit version of the operating system such as Windows 95, Windows NT 4.0, and Windows 3.x with Win32s installed. Of course it also works under Vista and Windows 7. The help file doesn't work with Windows OS beyond XP.

The Amiga version is in the archive FandP.lha.