ANSYS HFSS is described as 'Software is the industry-standard simulation tool for 3-D full-wave electromagnetic field simulation and is essential for the design of high-frequency and high-speed component design. HFSS offers multiple state-of the-art solver technologies based on either the proven' and is an app. There are four alternatives to ANSYS HFSS for Windows, Linux and Mac. The best ANSYS HFSS alternative is CST MICROWAVE STUDIO. It's not free, so if you're looking for a free alternative, you could try Antenna Magus or Vorpal.