Gap year volunteering after college

Top Producers of Fulbright U.S. Scholars and Students

Peace Corps lists the colleges and universities that produced the most Peace Corps Volunteers 
RPCV  returned Peace Corps volunteer

Graduates Nationwide Join Teach For America  TFA
Graduate School Partners, deferral

AmeriCorp VISTA volunteers in service to America

Jesuit Volunteer Corps

Info/reviews:
Volunteer Forever volunteer abroad
Go Abroad volunteer abroad
Study Abroad volunteer worldwide
Go Overseas  high school abroad volunteer abroad

Programs:
Projects Abroad high school specials
Voluntee HQ IVHQ high school volunteer abroad programs
Global Leadership Adventures GLA international volunteer programs for teens
Global Vision International under 18 volunteering abroad
Cross Cultural Solutions high school volunteer abroad

Doctors without Borders
National Health Service Corps