A:
Agricultural Research Service Software - Offers certain free, downloadable software and models for use in predicting and analyzing topics such as erosion, pest migration, crop growth, watersheds, and more. [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

F:
Fundamental and Computational Sciences Directorate - Research covers fundamental discoveries in biology, chemical and materials sciences, molecular science, atmospheric sciences, and computational sciences and mathematics. [U.S. Department of Energy (DOE), Pacific Northwest National Laboratory (PNNL)]