Ask HN: Hacking/Coding/Programming for Good?

I've been looking around for hackers (coders, etc) who also do socially good/conscious activities as well. I've come up short so I was hoping the HN community could help out. It's probably just me but I rarely see articles on hackers doing good (although a lot of startups have socially conscious messages, etc).

I know there's Code for America (making Gov't efficient), Taproot, and Catchafire but I've had a tougher time finding other like-minded initiatives or individuals.

And I'm not asking for any particular reason other than just to know.