http://www.bailii.org/ie/legis/num_act/
This collection of Irish legislation is being provided by the British and Irish Legal Information Initiative (BAILII). It is free of charge and in English only.

http://www.ucc.ie/law/newirlii/legislation/statdisp.php
A collection of all statutes from 1999 onwards, free of charge and in English.

http://www.lexadin.nl/wlg/legis/nofr/eur/lxweier.htm
Another collection of Irish legislation.

http://www.ucc.ie/law/irlii/irliiindex/irliiindex.php
The website of the Irish Legal Information Initiative (IRLII). It provides all court decisions of the High Court of Ireland 1933 onwards, the Supreme Court of Ireland from 1965 on and the Irish Court of Criminal Appeal 1954 on for free in English.

http://www.bailii.org/ie/cases/IESC/
This database contains decisions by the Supreme Court of Ireland from 1965 on, for free, in English.

http://www.bailii.org/ie/cases/IEHC/
As above, a database of court decisions. It contains the Irish High Court's decisions from 1933 on.