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)