A:
arXiv.org e-Print archive - An electronic archive for research papers in particle and theoretical physics, mathematics, nonlinear sciences, computational linguistics, and neuroscience [Department of Energy (DOE); National Science Foundation (NSF), Cornell University]

C:
Center for Computational Science and Technology - (CCST) - A supercomputing facility for high-end computational science and computer science research including compiting and visualization resources as well as storage resources [Department of Energy (DOE), Argonne National Laboratory (ANL)]

Center for Engineering Science Advanced Research (CESAR) - Conducts fundamental theoretical, experimental, and computational research in intelligent systems [Department of Energy (DOE), Oak Ridge National Laboratory (ORNL)]

Center for Theoretical and Computational Materials Science - CTCMS [Department of Commerce (DOC), National Institutes of Standards and Technology (NIST)]

Computer Science & Mathematics Division (CSM) - Expertise in basic and applied research in high performance computing, applied mathematics, and intelligent systems [Department of Energy (DOE), Oak Ridge National Laboratory (ORNL)]

D:
DOE Office of Advanced Scientific Computing Research (ASCR) - Develops the algorithms (mathematical rules and formulae), computer programs and hardware that advance scientific research. [Department of Energy (DOE), Office of Science (SC)]

DOE R&D Accomplishments - Provides a searchable database about the outcomes of past DOE research and development which have had significant economic impact, have improved people's lives, or have been widely recognized as remarkable advances in science [Department of Energy (DOE), Office of Scientific and Technical Information (OSTI)]

DOE R&D Highlights - Provides non-technical summary information about selected research conducted or sponsored by DOE and its National Laboratory infrastructure [Department of Energy (DOE)]

DOE R&D Project Summaries - Access summaries of ongoing or recently completed science and technology projects funded by the Department of Energy [Department of Energy (DOE), Office of Scientific and Technical Information (OSTI)]

E:
E-PRINT Network: Research Communication for Scientists and Engineers - A searchable gateway to over 19,650 Web sites and databases worldwide, containing e-prints in basic and applied sciences, primarily in physics and subjects of interest to DOE [Department of Energy (DOE), Office of Scientific and Technical Information (OSTI)]

Educational Sites for All Ages - All science subjects, with emphasis on biology, chemistry, and environmental science. [Department of Energy (DOE), Office of Biological and Environmental Research (BER)]

Energy Citations Database - Search bibliographic records for energy and energy-related scientific and technical information from the Department of Energy (DOE) and its predecessor agencies from 1948 forward [Department of Energy (DOE), Office of Scientific and Technical Information (OSTI)]

Engineering Statistics Handbook - An online tool to help scientists and engineers incorporate statistical methods in their work [Department of Commerce (DOC), National Institutes of Standards and Technology (NIST)]

F:
Federal R&D Project Summaries - Locate current research projects from a number of federal agencies [Department of Energy (DOE)]

Federal Resources for Educational Excellence - Mathematics - Identifies effective curriculum resources, create high-quality professional development materials, and disseminate useful information and products to improve K-12 mathematics teaching and learning [Department of Education (ED)]

G:
Guide to Available Mathematical Software - A cross-index and virtual repository of mathematical and statistical software components of use in computational science and engineering [Department of Commerce (DOC), National Institutes of Standards and Technology (NIST), Information Technology Laboratory (ITL)]

I:
Information Bridge - Search full-text of Department of Energy sponsored research and development reports [Department of Energy (DOE), Office of Scientific and Technical Information (OSTI)]

M:
Math, Statistics, and Computational Science - The site provides a variety of resources [Department of Commerce (DOC), National Institutes of Standards and Technology (NIST), Information Technology Laboratory (ITL)]

Mathematics and Computer Science Publications - A collection of journals, books, conference proceedings and technical reports from 1990 forward. [Department of Energy (DOE), Argonne National Laboratory (ANL)]

Matrix Market - A visual repository of test data for use in comparative studies of algorithms for numerical linear algebra [Department of Commerce (DOC), National Institutes of Standards and Technology (NIST), Information Technology Laboratory (ITL)]

N:
NEWTON BBS - Ask a scientist a question about math, science or computers or search through more than 15,000 previously answered questions [Department of Energy (DOE), Argonne National Laboratory (ANL)]

T:
Template Numerical Toolkit - A numeric library for scientific computing in C++ [Department of Commerce (DOC), National Institutes of Standards and Technology (NIST), Information Technology Laboratory (ITL)]