According to their website they are functioning and are on overdrive.
https://www.actionagainsthunger.org/donate/earthquake-haiti?s_src=homepage&s_subsrc=haitiAction Against Hunger has launched an immediate response to assist the victims of the devastating earthquake that hit Port-au-Prince, Haiti. Our teams on the ground are already carrying out rapid evaluations across the city, while additional support, equipment, and materials—including water treatment supplies, emergency vehicles, and communications equipment—are en route from our bases in the city of Gonaives. Our initial response will anticipate severe difficulties in access to drinking water. High rates of chronic malnutrition and the likely destruction of food stocks are also of immediate concern.
ACF responds to emergencies like this all over the world, delivering life-saving assistance to millions of people in crisis every year. We are able to provide critical emergency assistance—and help communities regain their livelihoods and secure food and water supplies for the future—thanks to the generosity of donors like you.