- American Mathematical Society Founded in 1888 to further the interests of math research and scholarship.
- Association for Women in Mathematics (AWM) The purpose of the Association for Women in Mathematics is to encourage women and girls to study and to have active careers in the mathematical sciences, and to promote equal opportunity and the equal treatment of women and girls in the mathematical sciences.
- Historical Math Monographs A collection of selected monographs with expired copyrights chosen from the mathematics field. Maintained by Cornell University Library.
- MacTutor History of Mathematics Created by the University of St. Andrews, Scotland.
- Math Forum @ Drexel University Online resource for improving math learning, teaching, and communication
- Mathematical Association of America: MAA Online The largest professional society that focuses on mathematics accessible at the undergraduate level.
- Mathematics Archives Portal to math information.
- Mathematics Genealogy Project A project by the Department of Mathematics at North Dakota State University to compile information about all the mathematicians of the world.
- Mathematics Virtual Library Maintained by the Florida State University Department of Mathematics.
- MathVids Math help and videos.
- Vifamath: Virtual Library of Mathematics Access to mathematic information. Portal based in Germany.
- Wolfram MathWorld The web's most extensive mathematical resource, updated daily.
- Women Mathematicians Biographies of women in mathematics. Maintained by Agnes Scott College.
- ScienceDaily: Mathematics News RSS Research news.
- Online resources in statistics Maintained by the Center for Astrostatistics, Penn State University.