John Grenham, the Irish professional genealogist and author, has links to a large number of useful Irish family history websites. There are links to each county in Ireland leading you to sites with information on censuses, church registers, cemeteries, Griffith's Valuation, directories and more. There are also passenger lists and links to family history pages by surname.
https://www.johngrenham.com
This website contains images from the NLI’s collection of Catholic parish register microfilms. The registers contain records of baptisms and marriages from the majority of Catholic parishes in Ireland and Northern Ireland up to 1880. You may search under a Parish name - or explore via the map.
http://registers.nli.ie
An ongoing endeavour to make the registers of baptism, marriage and burial from Church of Ireland parishes available in a digital format. The online version is hosted by the Representative Church Body Library, which will periodically introduce new transcripts of parish registers.
At time of writing this project is still very new but Delgany (Glendalough)Co. Wicklow is available along with Newtownbarry, Co. Wexford. Check the index volume in order to find individuals in the registers.
http://ireland.anglican.org/about/151
Church of Ireland Parish Registers throughout Ireland (Baptisms, Marriages, Burials & copies). What exists, dates covered, and where to find them
http://ireland.anglican.org/cmsfiles/...ry/registers/ParishRegistersTable.pdf
Church records from Dublin and Kerry. Free transcripts. Keep an eye on this site as other areas may be added.
http://www.irishgenealogy.ie
This website from the Irish Family History Foundation includes a searchable database where you can search over 18 million Irish parish register transcriptions. Register first and searching is free but you will need to pay to see the full record. Please note that not all counties are covered.
http://www.rootsireland.ie
This FamilySearch Research Wiki is full of useful information on how to find births, marriages and deaths in Ireland during the period of civil registration.
https://wiki.familysearch.org/en/Ireland_Civil_Registration-_Vital_Records
