AMS Books Online
AMS published books available for free download in PDF. Also links to other online books.
arXiv
E-print archive in various areas of physics, mathematics, nonlinear science, and computer science.
Books On-line: QA
Online Books page at the University of Pennsylvania.
Cornell Historic Math Book Collection
571 books that were scanned from originals held by the Cornell University Library. Each page is a GIF image.
E-books on the Smarandache function and other topi
A collection of E-books on Smarandache functions, sequences, problems, conjectures, geometries, neutrosophic logic, and paradoxes.
EJDE Monographs
Textbooks and expository articles hosted by the Electronic Journal of Differential Equations.
Electronic Books and Journals
Links maintained by the University of Haifa.
Electronic Research Archive for Mathematics
A digital library for classical mathematics.
EMIS Mathematical Monographs
Books hosted by the European Mathematical Information Service in various formats, typically PostScript, but sometimes also DVI and PDF.
Geometry & Topology Monographs
A series intended for research monographs, for refereed conference proceedings, and for similar collections.
ICTP Lecture Notes Series
Paedagogical material in advanced topics from the Abdus Salam International Centre for Theoretical Physics, Trieste. LaTeX and PostScript.
Math eBooks
Commercial solved-problem guides on various math topics in PDF format.
Mathematica
A collection of classical manuscripts (mostly in German) at the Center for Retrospective Digitization in Goettingen.
Mathematics Archives - Topics
Links to books, notes and other resources organized by topic at the University of Tennessee, Knoxville.
Mathematics lecture notes
Lecture notes collected by Matt Daws.
MATHnetBASE
Commercial library of mathematics texts and articles from CRC/Chapman and Hall. Annual subscription required.
MathPages
A collection of HTML lectures on various subjects in mathematics and physics.
Mathphysics.com
This site exists primarily to host on-line textbooks and other scholarly materials in mathematics or physics.
Maths at sigma.ndo.co.uk
Lecture notes for various courses taught at the Univ. of Birmingham.
Mathwright Library
A free collection of interactive mathematics and science books. Requires free (Windows) software to read.
NUMerisation de Documents Anciens Mathematiques
Digitized ancient mathematical documents in Grenoble.
Online Books and Lecture Notes in Mathematics
Collection of links at gotmath.com.
Online Mathematics Textbooks
Links to online mathematics texts, maintained by George Cain at Georgia Institute of Technology.
Online Notes
A collection of links to online notes maintained by Boris Levant at the Weizmann Insitute.
Tempus
Modules for applied mathematics, including modelling, discrete simulation, linear algebra, harmonic analysis and optimization. HTML with embedded GIFs. Some modules available in PostScript and in Estonian.
Textbooks in Mathematics
A collection of links by alex_stef@yahoo.com to free mathematics textbooks, lecture notes and tutorials.
The Assayer
Features online books and articles on math, computer and science topics by a variety of authors. Includes some reader reviews.
University of Michigan Historical Mathematics Coll
A digital library of books selected from the University of Michigan mathematics collection, published in the 19th or early 20th century.