Links to Web Sites on the History of Mathematics, British Society for the History of Mathematics.
Mobilizing Minds: Teaching Math and Science in the Age of Sputnik, Smithsonian; The references for additional reading are uniformly excellent, and overall, it's a site that will interest historians of science, Cold War buffs, and others.
Multi-Repository Mathematics Collections, University of Michigan and Cornell digital repositories of math books from the 19th or early 20th centuries,
MacTutor History of Mathematics Archives
ABACUS: The Art of Calculating with Beads, This site was created by Luis Fernandes, and it explores the wide world of the abacus through illustrations, thoughtful essays, and other items.
Bridges Organization: Art and Mathematics, in existence since 1998, the galleries area is particularly good.
MAA Online: Classroom Capsules and Notes, Mathematical Association of America (MAA) provides a range of high-quality educational resources for educators all across the United States and the world. Recently, they completed digitizing over 114 years of their short classroom materials, and they are now available here.
MAA: Found Math Gallery 2011, archives material back to 2007; features a new math-related photo every week.
MAA: Talk by Kevin McCurley of Google.com, November 2009; on the mathematics used to generate good search results.
National Girls Collaborative Project, advancing the Agenda for Gender Equity for Science, Technology, Engineering, and Mathematics This links to the newsletter; the project seeks to support efforts in gender- and diversity-related issues surrounding STEM fields.
STEM Education Coalition, works to support STEM programs for teachers and students through the U.S. Department of Education, the National Science Foundation, and other agencies that offer STEM-related programs.
STEM Equity Pipeline, as a past president of the National Academy of Engineering, put it, "A consequence of lack of diversity...[is that] we pay an opportunity cost, a cost in designs not thought of, in solutions not produced." Thus, in an effort to increase the diversity of the Science, Technology, Engineering, and Mathematics (STEM) workforce, the STEM Equity Pipeline was developed...