Although Maxwell's equations have been known for over 100 years, it was not until the last decade that they have seen regular use in applied high frequency design. The availability of sufficient computer processing capability is only part of the reason Maxwell's equations now enjoy regular application. Other developments requiring considerable effort are needed as well. These include increased attention to robustness, software testing, ease of use, portability, integration with other tools, and support. These developments are detailed in this paper.