What is the word that means those who help poor or sick people by donating money and sharing what they have?

Benefactors are people who give gifts, usually donations, to others. Philanthropists are people who use their wealth to a) further a non-profit cause, b) further science or art, or c) make donations to improve lives of less fortunate people.

A general Word for someone who shares what they have and helps others before themself is an altruist.