Extensive list of mathematics-related web sites, including academic departments, institutes, publishers, preprint servers, and software sources. From Pennsylvania State University.
This preprint archive, formerly LANL E-Prints Archive from Los Alamos National Library, for astrophysics, physics, mathematics, and computer science is now located at Cornell University. Mathematics coverage is from 1991.
Open access to 618,277 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.
"A cross-index and virtual repository of mathematical and statistical software components of use in computational science and engineering." From the National Institute of Standards and Technology.