These sources are great if your topic involves global issues or anything outside of the United States.
Many countries have a different point of view than that found in the U.S. Give your research an international perspective with these tools.
... But don't forget GoogleGov
IGO Search
Searches hundreds of Inter-Governmental Organizations, like the United Nations, World Bank, World Health Organization, etc. (What's included).
NGO Search
Nongovernmental organizations associated with international research organizations (what's included).
U.S. State Department
Agency concerned with international relations and how countries interact.
Good source for country data and issues
Key reports:
USAID
Aid to countries struggling with poverty, political, and humanitarian issues