AMS published books available for free download in PDF. Also links to other online books.

E-print archive in various areas of physics, mathematics, nonlinear science, and computer science.

Online Books page at the University of Pennsylvania.

571 books that were scanned from originals held by the Cornell University Library. Each page is a GIF image.

A collection of E-books on Smarandache functions, sequences, problems, conjectures, geometries, neutrosophic logic, and paradoxes.

Textbooks and expository articles hosted by the Electronic Journal of Differential Equations.

Links maintained by the University of Haifa.

A digital library for classical mathematics.

Books hosted by the European Mathematical Information Service in various formats, typically PostScript, but sometimes also DVI and PDF.

A digital collection of classics from the National Library of France.

A series intended for research monographs, for refereed conference proceedings, and for similar collections.

Paedagogical material in advanced topics from the Abdus Salam International Centre for Theoretical Physics, Trieste. LaTeX and PostScript.

Commercial solved-problem guides on various math topics in PDF format.

A collection of classical manuscripts (mostly in German) at the Center for Retrospective Digitization in Goettingen.

Links to books, notes and other resources organized by topic at the University of Tennessee, Knoxville.

Lecture notes collected by Matt Daws.

Commercial library of mathematics texts and articles from CRC/Chapman and Hall. Annual subscription required.

A collection of HTML lectures on various subjects in mathematics and physics.

This site exists primarily to host on-line textbooks and other scholarly materials in mathematics or physics.

Lecture notes for various courses taught at the Univ. of Birmingham.

A free collection of interactive mathematics and science books. Requires free (Windows) software to read.

Digitized ancient mathematical documents in Grenoble.

Collection of links at gotmath.com.

Links to online mathematics texts, maintained by George Cain at Georgia Institute of Technology.

A collection of links to online notes maintained by Boris Levant at the Weizmann Insitute.

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.

A collection of links by alex_stef@yahoo.com to free mathematics textbooks, lecture notes and tutorials.

Features online books and articles on math, computer and science topics by a variety of authors. Includes some reader reviews.

A digital library of books selected from the University of Michigan mathematics collection, published in the 19th or early 20th century.