There’s no such list maintained by any one web site or organization.
The World Food Programme and UNICEF are two of the largest organizations who, among other things, deal with food crisis. CARE International is focused on women and children, and helping women to develop sustainable livelihoods. Oxfam and Save the Children UK are also focused on supporting local people to provide for themselves. All of these organizations work in partnership with local NGOs in the developing world.
ReliefWeb is a great place to lear the latest about the most critical natural disasters and food crisis facing the world:http://www.reliefweb.int