Sites

GSA (Popularity: )
http://www.geosociety.org/profdev/grants/
Grants for undergraduate and graduate students, as well as other grants from the Geological Society of America.

NERC Centres for Atmospheric Science (Popularity: )
http://ncas.nerc.ac.uk/
Centres and facilities distributed across various United Kingdom academic institutes tasked with carrying out the core research programme in atmospheric science funded by the Natural Environment Research Council (NERC).

Sigma Xi (Popularity: )
http://www.sigmaxi.org/programs/giar/index.shtml
Graduate student research funding from Sigma Xi.