WANGO's Worldwide NGO Directory
An interactive map of non-governmental organizations that are part of WANGO, the World Association of Non-Governmental Organizations
Candid.org
Find directory information about the largest public and private foundations in the U.S. and links to foundation web sites
GuideStar
Search for financial, contact, and leadership information for U.S. nonprofit organizations.
List of NGOs in official partnership with UNESCO
This PDF has quite a long list of NGOs
InterAction NGO Aid Map
Interactive map showing current projects from nongovernmental organizations that are members of InterAction
Urban Institute's National Center for Charitable Statistics - projects
On this page, "users can find many of the NCCS information they are used to seeing listed as publications, including summary tables for public charities and private foundations by state, type, age, and size, as well as lists of the largest organizations by subsector."
ReliefWeb
A project of OCHA, the UN's Office for the Coordination of Humanitarian Affairs, this website "monitors and collects information from more than 4,000 key sources, including humanitarian agencies at the international and local levels, governments, think-tanks and research institutions, and the media. Our editors select, classify, curate and deliver the content that is most relevant to global humanitarian workers and decision-makers on a 24/7 basis"
National Center for Charitable Statistics Data Archive
The data produced by NCCS are intended for use by researchers and policy-makers in their quantitative analyses of nonprofits in the United States.