Seven famous ones:
National Archives of Ireland
www.nationalarchives.ie
Irish Genealogy
www.irishgenealogy.ie
Ask About Ireland
www.askaboutireland.ie
The National Library of Ireland
www.nli.ie
Liberty Ellis Foundation
www.libertyellisfoundation.org
British Newspaper Archive
www.britishnewspaperarchive.co.uk
Ordnance Survey Ireland
www.osi.ie
….and three more unusual sites….