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A commercial site hosted by the University of Texas at El Paso. It has many resources related to many areas of mathematics, like algebra, trigonometry, calculus, differential equations, and more.
arXiv is a free distribution service and an open-access archive for 2,109,137 scholarly articles in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics. Materials on this site are not peer-reviewed by arXiv.
Project Euclid hosts over 100 mathematics and statistics publications from around the world, including some of the most distinguished in their fields. Through a combination of support by subscribing libraries and participating publishers, 80% of the papers hosted on Project Euclid are openly available.
The Women in Math Project was created in 1997 by Marie A. Vitulli, Professor of Mathematics, Emerita, at the University of Oregon. This site provides comprehensive resources and information for and about women in math.