Online Books Store    

http://www.ams.org/online_bks/online_subject.html

Collection of American Mathematical Society, consist of several links for research level mathematics.

http://www.atlanticbooks.com

Atlantic Publishers & Distributors is a leading Publisher, Importer & Distributor of Indian & Foreign books in Social Science, Pure Sciences, Medicine, Management, Literature and all other subjects.

http://builder.books24x7.com/home.asp

Builder.com is the most insightful new software development site on the Web. Created by developers, for developers, Builder.com brings software developers fresh, real-world perspective on topics from programming to architecture to management. Builder.com will improve the way developers work with the information, tools, and services to help them conquer the challenges they face everyday in real-world development.  

http://www.ipl.org

Collection of several books, magazines and newspapers available free to download.  

http://ocw.mit.edu/OcwWeb/index.htm

Provide free, searchable, access to MIT's course materials for educators, students, and self-learners around the world.

http://www.nikkeibp.com

Statistics.com gives data analysts, researchers, educators, managers and students tools to build their statistical skills and improve their understanding of statistics.

http://www.questia.com

Questia is the first online library that provides 24/7 accesses to the world's largest online collection of books and journal articles in the humanities and social sciences, plus magazine and newspaper articles. You can search each and every word of all of the books and journal articles in the collection. You can read every title cover to cover. This rich, scholarly content -- selected by professional collection development librarians -- is not available elsewhere on the Internet.

http://www.statistics.com/content/onlinebooks.html

Publishers of resource materials for both Training and Education in ALL subject areas in English and Arabic.

http://www.nap.edu

The National Academies Press (NAP) was created by the National Academies to publish the reports issued by the National Academy of Sciences, the National Academy of Engineering, the Institute of Medicine, and the National Research Council, all operating under a charter granted by the Congress of the United States. NAP publishes over 200 books a year on a wide range of topics in science, engineering, and health, capturing the most authoritative views on important issues in science and health policy. The institutions represented by NAP are unique in that they attract the nation's leading experts in every field to serve on their blue ribbon panels and committees. For definitive information on everything from space science to animal nutrition, you have come to the right place.

http://digital.library.upenn.edu/books/

Listing over 20,000 free books on the Web with the searching facility by Author, Titles, subjects and serials.