"A nongovernmental organization (NGO) is an organization independent of the government whose primary mission is not commercial, but focuses on social, cultural, environmental, educational, and other types of issues....Coordination is vital to every emergency situation. Disaster response and relief organizations and agencies working in concert clearly provide a greater sum benefit than they could working on their own." ...

Coppola, D. P. (2007) Introduction to International Disaster Management, p.387-449,  Listing below based on Appendix 9-2, p. 426-445 

NGOs Involved in the December 26, 2004 Asia Tsunami Disaster Response and Revovery Operations as of January 1, 2006.

ReliefWeb is an on-line gateway to information (documents and maps) on humanitarian emergencies and disasters. An independent vehicle of information, designed specifically to assist the international humanitarian community in effective delivery of emergency assistance, it provides timely, reliable and relevant information as events unfold, while emphasizing the coverage of "forgotten emergencies" at the same time.

ReliefWeb was launched in October 1996 and is administered by the UN Office for the Coordination of Humanitarian Affairs (OCHA).