Here are the key charities who have been on the frontlines of the Syrian crisis. 

UNHCR: www.unrefugees.org/donate UNICEF: www.unicefusa.org World Food Program: www.wfp.org  Save the Children: www.savethechildren.org  International Medical Corps: www.internationalmedicalcorps.org International Rescue Committee: www.rescue.org Doctors Without Borders: www.doctorswithoutborders.org Mercy Corps: www.mercycorps.org Syrian Medical Society: www.sams-usa.net