Although I have received the Kennedy-Lugar scholarship and participating in YES Abroad, AFS is the organization that YES uses to facilitate the program in Indonesia and some other YES countries such as Ghana, Turkey, Thailand, Malaysia, and India. The other YES country programs are done through AMIDEAST, American Councils, or iEarn. For me, AFS places me in a school, with a host family, and are my go-to people while abroad.
AFS offers year, semester, and summer foreign exchanges, gap year programs, and community service programs abroad, on every continent except Antarctica. These programs cost money, but you also must apply and I think generally you get to choose your country. If you aren't interested in the YES countries and you have the money then you should check out AFS- they also might have some scholarships of their own, but I'm not sure.