MAXDGTD-2D is a discontinuous Galerkin code for solving Maxwell's equations in the time-domain by Hassan Fahs.  A Fortran90 version will be available in January 2011.

• Link (15 Non 2010)

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.

• Link (8 Mar 2009)
• Link (12 Nov 2013)

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)

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)

2D domain  Finite-Difference Time-Domain method, FDTD program by Robin Hogan.

• Link (17 Jun 2010)

Jfdtd3D

Java based Jfdtd3D solves for all 6 vector components of the electromagnetic field. By Jeffrey M. McMahon.

• Link (30 Jan 2009, 3 Aug 2015)

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)

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.

• Link (12 Nov 2013)
• Link (12 Nov 2013)
• Link
• Link (28 Mar 2019)

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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 Chombo package provides a set of tools for implementing finite difference methods for the solution of partial differential equations on block-structured adaptively refined rectangular grids.

• Link (12 Nov 2013)