Below, NGOs are categorized according to "primary focus," but keep in mind that sorting them in this way risks dramatic oversimplification. For example, one of the largest and most widely recognized NGOs, WWF, could be reasonably listed as nature-focused, education-focused, economy-focused, etc. This holds true for many if not most (if, ultimately, not all) NGOs. But I'm doing it here because there is a certain efficiency and logic to it all. I plan at some point to make a master alphabetical listing of all NGOs.