Republican Sinn Féin
- Led by Ruairí Ó Brádaigh the group split from (Provisional) Sinn Fein in the 1980s. The party rejects the Good Friday Accord.
- http://www.rsf.ie/

Irish Republican Socialist Movement
- Committed to the ideas of Irish Marxist James Connolly and the creation of an Irish workers' republic, the IRSM is descended from the Official Irish Republican Army. Includes press releases.
- http://www.irsm.org/

The Workers Party
- Seeks to establish a democratic, secular, socialist united Republic of Ireland. Site includes party history, policies and news. Formerly known as Official Sinn Fein. The party supports the Good Friday Agreement.
- http://www.workers-party.org/

Irish Republican Socialist Party
- Founded in 1974 after a split in Official Sinn Fein. Site includes IRSP documents, pamphlets, history and other resources. IRSP is the political arm of the Irish National Liberation Army. The party supports the cease-fire but opposes the Good Friday Agree
- http://www.irsm.org/irsp/