FreeCEN Has good coverage of the census records of Caithness.
Caithness Owners of Land Owners of lands and heritages 1872-1873 including the return of the name and address of every owner of one acre and upwards in extent. The annual value of the lands and heritages of individual owners, and owners of less than one acre.
Caithness Gravestone Images Many images of gravestones from various cemeteries around Caithness. You can also view and download the full size images.
Caithness Family History Society Caithness Family History Society was formed in September 1999 by a small group of enthusiasts and has already grown to some 350 members worldwide. Its aim is to promote an interest in genealogy and, wherever they can, to help others trace their roots – especially families originating from Caithness.