KiCad is a open source software limited to Printed Circuit Design. A wide range of printed circuit board libraries as well as board layouts are available for it with a free license.
The KiCad format can be used in any way by the LayoutEditor. The schematic and board files can be loaded and the library can be used as a component library. The older and the newer KiCad format is supported. Inside the EditComponent dialog in the SchematicEditor, parts can be imported from the MOD file format. To do so, press the import button within the dialog and choose a library file and then a component of the library. All layers will be converted to the default PCBLayerSetup. The PCB file format design rules will be used. To perform an import simply open a the file with the OpenFile feature. Do not use this import feature without additional validation. An export to the KiCad format is not supported.