UK Family Historians will find the GENUKI site of interest at:- http://www.genuki.org.uk
If your interests cover Somerset or Dorset in the UK then
visit the Somerset & Dorset Family History Society site at:-
http://www.sdfhs.org.uk
LDS Churchat:-http://www.familysearch.com
UK Public Record Office at:-http://www.nationalarchives.gov.uk
UK Ordanance Survey Maps:- www.streetmap.co.uk
For wider Euopean Resources:- https://ourpublicrecords.org/europe-family-records/
Three projects that aim to provide "free-to-view" online searchable databases of UK records
relevant to family historians are:-
Civil Registration:- Births, Marriages & Deaths:-
www.freebmd.org.uk
Census records:-www.freecen.org.uk
Parish Records & Non Conformist Church Registers:- Baptism, Marriages & Burials. www.freereg.org.uk
Parish records:-www.freereg.org.uk
This site will try to match you with your lost cousins.
Most of the facilities are free and with an excellent regular E-mail news letter with a mine of information on all aspects of Family History