Salaam Balak Trust : the aim of the organization is to provide a caring environment for the children. volunteer in education, mental health and health care, computer skills, creative expression (such as sport)… It is beter if you can volunteer for a long period but you can also do it if you have a short period.
Tara kids. Vsisit this website: http://www.taraindia.org/. This NGO provides a great environment to some kids who come from underprivileged backgrounds. Members who volunteer come from all over the world. They give them an education, they help them to dream of a future, and make these dreams come true.
Concern India Foundation (http://www.concernindiafoundation.org/) .This NGO helps in the areas of education, health and community development. They support over 270 NGO in India, gives education to more than 42,000 people, and improves the health and hygiene of 1,17,000 people.You can donate or come and volunteer.