Ask HN: What organizations mix of social action with technology?

As a computer science student whose other passion is touching lives, I've always found it hard to bridge the gap between my skillset and bringing about social change. Other disciplines such as architecture, mech / enviro engineering, teaching appear more helpful. But small non-profits like Refugees United and WorldReader have interesting "business" models that center around computer technology. I'm a little inspired. Indulge my interest... What other companies and organizations have an interesting mix of social action with technology?