Resources

The United Nations website has links to the High Commissioner for Human Rights, the Universal Declaration, and the UN Treaty Series.
The UN Office of the High Commissioner for Human Rights also has links to the various treaties, publications, and resources, including downloadable collections of the main treaties and links to the Human Rights Monitoring Bodies.
The UN Human Rights Committee (HRC) website contains materials relating to the Covenant on Civil and Political Rights
The UN Economic and Social Council (ECOSOC) website contains a database of documents on economic, social and cultural rights.
The Treaty Bodies Database contains the jurisprudence of the HRC, ECOSOC and the other UN monitoring bodies as well as texts of other materials relevant to the work of the HRC, including reports by State Parties.

Material from the European Court of Human Rights (ECtHR)
The Council of Europe website has links to its treaties and a tab for the ECtHR and its jurisprudence.
Material from the Inter-American Court of Human Rights