Web Directory

» AMS Books Online
   AMS published books available for free download in PDF. Also links to other online books.
   http://www.ams.org/online_bks/

» Books On-line: QA
   Online Books page at the University of Pennsylvania.
   http://digital.library.upenn.edu/webbin/book/subjectstart?QA

» EJDE Monographs
   Textbooks and expository articles hosted by the Electronic Journal of Differential Equations.
   http://ejde.math.txstate.edu/mono-toc.html

» EMIS Mathematical Monographs
   Books hosted by the European Mathematical Information Service in various formats, typically PostScript, but sometimes also DVI and PDF.
   http://www.emis.de/monographs/

» Electronic Research Archive for Mathematics
   A digital library for classical mathematics.
   http://www.emis.de/projects/JFM/

» Gallica
   A digital collection of classics from the National Library of France.
   http://gallica.bnf.fr

» Geometry & Topology Monographs
   A series intended for research monographs, for refereed conference proceedings, and for similar collections.
   http://www.msp.warwick.ac.uk/gt/2009/13-04/

» MATHnetBASE
   Commercial library of mathematics texts and articles from CRC/Chapman and Hall. Annual subscription required.
   http://www.mathnetbase.com/

» Math eBooks
   Commercial solved-problem guides on various math topics in PDF format.
   http://www.math-ebooks.com/

» MathPages
   A collection of HTML lectures on various subjects in mathematics and physics.
   http://www.mathpages.com/

» Mathematica
   A collection of classical manuscripts (mostly in German) at the Center for Retrospective Digitization in Goettingen.
   http://gdz.sub.uni-goettingen.de/en/

» Mathematics Archives - Topics
   Links to books, notes and other resources organized by topic at the University of Tennessee, Knoxville.
   http://archives.math.utk.edu/topics/

» Mathphysics.com
   This site exists primarily to host on-line textbooks and other scholarly materials in mathematics or physics.
   http://www.mathphysics.com/

» Maths at sigma.ndo.co.uk
   Lecture notes for various courses taught at the Univ. of Birmingham.
   http://www.sigma.ndo.co.uk/maths/

» Mathwright Library
   A free collection of interactive mathematics and science books. Requires free (Windows) software to read.
   http://www.mathwright.com/

» NUMerisation de Documents Anciens Mathematiques
   Digitized ancient mathematical documents in Grenoble.
   http://www.numdam.org/

» Online Mathematics Textbooks
   Links to online mathematics texts, maintained by George Cain at Georgia Institute of Technology.
   http://www.math.gatech.edu/~cain/textbooks/onlinebooks.html

» Online Notes
   A collection of links to online notes maintained by Boris Levant at the Weizmann Institute.
   http://www.wisdom.weizmann.ac.il/~borisl/online_notes.html

» Textbooks in Mathematics
   Alex Stef's links to free mathematics textbooks, lecture notes and tutorials.
   http://mathbooks.110mb.com/mylist.php

» The Assayer
   Features online books and articles on math, computer and science topics by a variety of authors. Includes some reader reviews.
   http://www.theassayer.org/cgi-bin/asbrowsesubject.cgi?class=Q

» University of Michigan Historical Mathematics Collection
   A digital library of books selected from the University of Michigan mathematics collection, published in the 19th or early 20th century.
   http://quod.lib.umich.edu/u/umhistmath/

» arXiv
   E-print archive in various areas of physics, mathematics, nonlinear science, and computer science.
   http://arxiv.org/