In this web page, the conventional and high accuracy nonstandard (NS) finite difference time domain (FDTD) algrotihms and its programs and demonstrations are presented.
- Link (22 Sep 2010)
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A free (for non-commercial purposes) Transmission Line Matrix Method (TLM) simulator with an open source graphical user interface by Petr Lorenz.
- Link (16 Mar 2009)
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The commercial EM Explorer is a 3D electromagnetic (EM) solver based on Finite Difference Time Domain (FDTD) for scattering problems of periodic structures illuminated by arbitrary incident fields including planewaves and Gaussian beam.
- Link (16 Mar 2009)
The open source package OpenGEMS is based on the parallel Finite Difference Time Domain method, and is a simplified version of Commercial GEMS Simulator. OpenGEMS is developed based on Microsoft DirectX for the 3-D modeling and Microsoft Excel for the data post-processing.

Yatpac (Yet Another TLM Package) by Peter Russer is a free TLM-based full-wave electromagnetic simulation package developed at the Institute for High-Frequency Engineering of the Technische Universität München in Germany. With Yatpac you can characterize in time-domain various electromagnetic structures like hollow waveguides, transmission lines, planar microwave circuits and antennas.
- Link (8 Mar 2009) down (24 Jan 2011)
- Archive (Binaries for WinXP, MacOS X still available, 24 Jan 2011)
The software package NekCEM (Nekton for Computational Electromagnetics) includes a Maxwell time domain solver based on the spectral element discontinuous Galerkin (SEDG) method employing a conformal spectral-element mesh. By Misun Min.

