Ask HN: Looking for software work in non-profit

I've been dreaming of applying my skills to working full-time at a nonprofit organization, but have no idea how to start. It seems like they're so difficult to find, and the ones that I do find just don't ever seem to need software developers.

Does anyone have a clue how I can be an engineer for an NGO? I'm particularly interested in causes helping children, but open to options. Even prepared to take a pay cut to fit modest budgets.