Ask HN: Companies with a social conscience?

After 15 years as a software developer working in finance I would love to make a partial or complete career change into a field or company that does something that contributes to society or directly helps people. I'm in the UK, but willing to consider anything. Currently my list is short and consists of Microsoft (MSR have a group called the Enable group), and Special Effect (a UK charity which builds gaming solutions for disabled people). Can you suggest any others?