Ask HN: Best way to help the world with software engineering?

It's a common sentiment that the software engineering problems that command the highest pay aren't the most important ones to solve. If I don't care about getting paid anymore, I'd like to know the most effective ways I can use my software engineering skills to help the world and make a difference.

This is obviously very subjective because it depends on how you think the best way to help the world could be. I'm sure some may argue that typical software engineering helps the world, albeit with some degrees of separation, but I'm sure there are people out there that know of great causes that could use a software engineer.