Cactus Code Thorn MaxwellFDTD
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CVS info   : $Header$
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Purpose of the thorn:

Minmalist, 3D FDTD code demonstrating the basic tasks in implementing a
simple 3D FDTD simulation. An idealized rectangular waveguide is modeled 
by treating the interior of the mesh as free space and enforcing PEC 
conditions on the faces of the mesh. A simplified plane wave source is inserted
at one end. 

Based on a code by Larie E. Miller, Paul Hayes and Mathew O'Keefe
http://gfs.lcse.umn.edu/toyfdtd/