Several organizations are involved in helping earth quake survivors in Nepal. Financial donations seem to the be most flexible and quick. But if you can only provide in-kind help, the United Nations Office for the Coordination of Humanitarian Affairs (OCHA) can accept these donations. Email logik@un.org for more information. Here's some information from UN OCHA.
Other organizations involved in relief work in Nepal that are accepting donations include the following, listed in alphabetical order. Many of them accept online donations.
AmeriCares
America Nepal Medical Foundation
Direct Relief
Doctors Without Borders / Medecins Sans Frontieres
International Medical Corps
Nepal Red Cross Society
Other organizations involved in relief work in Nepal that are accepting donations include the following, listed in alphabetical order. Many of them accept online donations.
AmeriCares
America Nepal Medical Foundation
Direct Relief
Doctors Without Borders / Medecins Sans Frontieres
International Medical Corps
Nepal Red Cross Society