National Archives

The national Archives of Ireland hold a wealth of information some of which has been made available online.

http://www.nationalarchives.ie/ 

Their online records include:

Parish Registers

https://registers.nli.ie/

Genealogy records

Including census records for 1901 and 1911, the Tithe Applotment Books, Wills and more.

http://www.genealogy.nationalarchives.ie/