CEDEUS CSW
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Geonode comes with pyCSW installed (see FAQ pyCSW). A request can look like that:
http://datos.cedeus.cl/catalogue/csw?service=CSW&version=2.0.2&request=GetRecords&typenames=csw:Record&elementsetname=full&resulttype=
As one can see it includes spatial and non-spatial records. Another option is to use a CSW plugin for GeoServer (but this is of course not installed for GeoNode).