[kgmpers]

I don't know how many tech related job listings they have, but you could look at http://www.idealist.org/.

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."