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Actually there is one. It's a no profit organization called Afs (afs.org). Its main purpose is to make adolescents (students between 14-17yo) explore a new country being hosted in a local family and studying in a local school. The participant makes a list of 10 (or less) preferred countries to which he'd like to go but can't choose the city. The latter is chosen depending on the compatibility with the families disponible in that country. The whole network of countries and hosting families is composed by volunteers (no economic benefits) all over the world who share the same goals: discovering and understanding new cultures. Disclaimer: I went one year abroad with afs and am currently a volunteer in my country.