Missionaries of Charity

The Missionaries of Charity are perhaps the most well-known religious order due to their founder Mother Teresa. Here is the Wikapedia definition of this order:

Missionaries of Charity is a Roman Catholic religious order established in 1950 by Mother Teresa of Calcutta, which consists of over 4,500 sisters and is active in 133 countries. Members of the order designate their affiliation using the order's initials, "M.C." Member nuns must adhere to the vows of chastity, poverty and obedience, and the fourth vow, to give "Wholehearted and Free service to the poorest of the poor".
Missionaries care for those who include refugees, ex-prostitutes, the mentally ill, sick children, abandoned children, lepers, AIDS victims, the aged, and convalescent. They have schools run by volunteers to educate street children, they run soup kitchens, as many other services as per the communities' needs. They have 19 homes in Kolkata (Calcutta) alone which include homes for women, for orphaned children, and for the dying; an AIDS hospice, a school for street children, and a leper colony. These services are provided to people regardless of their religion or social caste.

While in Ethiopia I went to their orphanage just outside the capital. They provide a home and school for children from infancy to high school, many who are HIV positive. I was amazed by these beautiful women.

To donate to the Missionaries of Charity: http://www.cmswr.org/member_communities/MC.htm