CAPITOLE-RF is antenna-design simulation software from the French company Nexio. Engineers in design offices for radiocommunications, radar and radiolocation use it to calculate radiation pattern, gain, directivity, matching (impedance, S11), electric and magnetic fields and coupling. It imports CAD files and offers 3D modelling, a mesher, material properties and 2D and 3D display of results. According to the vendor, its solvers are based on the method of moments. A free evaluation version is available on request. Nexio also supplies the BAT range for automated EMC measurements and electromagnetics services.
Nexio is headquartered in Toulouse, France, and its legal notice names no parent company. The website does not say how the software is delivered or where any data is stored, so ask the vendor. For a European organisation this means a French supplier under EU law. Anyone working with sensitive design data can settle this in the licence and support terms.