Site is broken up by high school student, undergraduate student, and graduate student in addition to careers, summer math programs, books for student mathematicians, how to apply for graduate school, and more.
Descriptions of a wide variety of careers for which a background in the mathematical sciences is useful. Each of the jobs presented profiles real people in real jobs. There are really no limits to what you can do if you are well prepared in mathematics. -- Publisher description
Online companion to the NIST Handbook of Mathematical Functions [Pius Library QA331 .N57 2010], which is a complete revision of the 1964 edition of Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables by Abramowitz and Stegun and published by the National Bureau of Standards [Pius Library QA 47 .A34 1965].