But I'm wondering if there is some sort of job listing or board that brings together all the salaried jobs (sorry, gotta eat), that help humanity directly in some way.
This is their mission statement:
"Idealist connects people, organizations, and resources to help build a world where all people can live free and dignified lives.
Idealist is independent of any government, political ideology, or religious creed. Our work is guided by the common desire of our members and supporters to find practical solutions to social and environmental problems, in a spirit of generosity and mutual respect."
Edit: You'll most definitely want to avoid the big organisations. Also, right now you could join about any NGO and get sent to the Philippine, small NGOs usually work as meritocracy. And networking is key in this field.