AmeriCorps is for youth ages 18 to 24. Serve your community for one year, earn a small stipend, and get health insurance as well as help paying for college.
Job Corps offers free job training for low-income youth ages 16-24; live on campus, receive health care, counseling, and job placement.
YouthBuild trains youth in construction skills by building housing for homeless and low-income people. For ages 16-24 who are not in school or employed.