Ireland

Gen UKI: UK and Ireland Genealogy – http://www.genuki.org.uk
Queens University Belfast: Centre for Data Digitisation and Analysis – http://www.qub.ac.uk/research-centres/CentreforDataDigitisationandAnalysis

Northern Ireland

The Public Record Office of Northern Ireland (PRONI) – https://www.nidirect.gov.uk/proni
RASCAL: Research and Special Collections Available Locally – http://www.rascal.ac.uk

Republic of Ireland

General Register Office – http://www.welfare.ie/en/Pages/General-Register-Office.aspx/Pages/VariationRoot.aspx
National Archives of Ireland – http://www.nationalarchives.ie