There's no set list, but some of the leading volunteer organizations are the Salvation Army and the American Red Cross. The Salvation Army boasts that they have approximately 3.5 million volunteers.
One can find information on community organizations by going thru all volunteer organizations like United Way, Volunteer New Jersey, Volunteer Match, Volunteer Solutions and many others.
Not all volunteer organizations non-profit, some are companies who wish to lend a helping hand to help those in need. But the majority of volunteer organizations are non-profit.
World Vision, Samaritan's Purse, and Compassion International are some of the more famous Christian volunteer organizations.
International Volunteer HQ is an organization that you can volunteer in Nepal with. Not sure if that was what you were asking.
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One can become a charity volunteer by applying at various charitable organizations. One can find out where local charity organizations are, like animal shelters, and apply at them.
Your son can be a volunteer tutor. He can contact organizations that are in need of tutors. He can also go to idealist.org for volunteer opportunities in your surrounding neighborhood.
There is a great site called Volunteer Match which gives lists of volunteer opportunities in your desired city, use the following site to be matched: http://www.volunteermatch.org/search/index.jsp?r=msa&l=39901
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To get involved as a volunteer for children in your community, you can start by reaching out to local schools, community centers, or youth organizations to inquire about volunteer opportunities. You can also search online for organizations that focus on children's welfare and see if they have any volunteer programs available. Additionally, consider contacting local government agencies or non-profit organizations that work with children to see how you can contribute your time and skills to help make a positive impact in their lives.
Wartime shortages affected just about everyone including unions and volunteer organizations. Pay raises and striking were limited during the war and volunteers were expected to work many hours.
Many large corporations have volunteer organizations. Maxwell House is fairly notable, at least in so much that it advertises its program on television. Some small, local businesses may also have their own programs.