I’ve spent a short time in India in February 2013.
The project I went with focuses on two Adivasi-villages, Ghosaldanga and Bishnubati, in west Bengal. Since 1984, when Martin Kaempchen started and inspired the work to encourage and support the inhabitants of the villages in all areas of life (but still keep the cultural balance) this project went on, support by voluntary donations.
This (German) and this (English) is their site.
I visited their schools, taught a bit english but mainly absorbed and sat by to get a really small understanding of how their life work. It was a really special and challenging time for me.