I've had in the past some people asking for me to support Eagle PCB boards in FlexBV ( Board viewer ).
While I don't read in the Eagle BRD files directly, FlexBV does now support reading the Fabmaster or Hyperlynx exports that Eagle provides.
Same applies for KiCAD and several other systems which can export to such formats.
Also support Altium Designer PCB/PCBDOC (ASCII) and GenCAD