What type of organizations like Peace Corp exist where I can utilize my computer science degree?

I have a degree in computer science and math and would like to utilize them to help people. I just don’t belong in a cubicle farm and I have a compassion to help people and volunteer. I love to teach too.
I was wondering what organizations exist to help me accomplish this goal.
Thanks!

I am planning to take Computer Science courses and would like to get a head-start?

I’m going to college and major in Computer Science.
I would like to get a head start before going in.
Any books or subject recommendations?