Doctors Without Borders (MSF) provides medical services worldwide wherever there is a need. They were the first on the scene to treat Ebola patients in West Africa last year (and in years past). They provided vaccines for various diseases like polio and measles. They have been treating victims from the Israeli-Palestinian conflict. They have been working to end the cholera epidemic in Haiti. They provided both mental and physical healthcare to people in eastern Ukraine. In 1999, MSF won the Nobel Peace Prize in recognition of their incredible humanitarian works.
Additional information about MSF, including their policies and accountability, can be found here.