brd to stl conversion is most likely searched for the purpose of exporting designs of PCB (Printed Circuit Boards) to STL format, typically for 3D printing. Except for Autodesk Eagle, you can find several other 3rd party alternatives that support .brd files and can be used for such export. Some tools might require a special plugin or addon to add support for BRD format.
Updated: August 31, 2023