National Digital Library is a initiative by HRD ministry and it is a huge collection of resources (68 lakh books), where you can read online or download the books from primary to research level. Anybody can use it free of charge.  To register go to: http://ndl.iitkgp.ac.in

Shodhganga a reservoir of Indian theses is a digital repository of theses and dissertations submitted to Indian universities. It is maintained by INFLIBNET Centre of the UGC. The repository has a collection of 1,05,510 theses and 3485 synopses online. For access please go to: http://shodhganga.inflibnet.ac.in/

Free e-Books

  • World E-Book Library -  The World Library Foundation is the world's largest aggregator of eBooks. Founded in 1996, theWorld Library Foundation is a global coordinated effort to preserve and disseminate historical books, classic works of literature, serials, bibliographies, dictionaries, encyclopedias, and other heritage works. For more details, you may click here - http://community.worldlibrary.in/?AffiliateKey=NDL-RU1227 
  • The Universal Digital Library - The Universal Digital Library is the collection of all the significant literary, artistic, and scientific works of mankind which has been made freely available, in every corner of the world, for education, study, and appreciation and that of all our future generations. For more details, visit http://www.ulib.org/
  • Million Book Project - The Million Book Project (or the Universal Library) was a book digitization project led by Carnegie Mellon University School of Computer Science and University Libraries from 2007-2008. Working with government and research partners in India (Digital Library of India) and China, the project scanned books in many languages, using OCR to enable full text searching, and providing free-to-read access to the books on the web. As of 2007, they have completed the scanning of 1 million books and have made the entire catalog accessible online. --https://archive.org/details/millionbooks

Open Courseware

Open Education Consortium - a global network of educational institutions, individuals and organizations that support an approach to education based on openness, including collaboration, innovation and collective development and use of open educational materials. The Open Education Consortium is a non-profit, social benefit organization registered in the United States and operating worldwide. http://www.oeconsortium.org/

Open Courseware (OCW) Sites for a Free Education

1. MIT Open Courseware - http://ocw.mit.edu/index.htm
2. Open Courseware Consortium - http://www.ocwconsortium.org/
3. Yale OCW - http://oyc.yale.edu/
4. Open. Michigan, University of Michigan OCW - http://open.umich.edu/
5. John Hopkins Bloomberg School of Public Health OCW - http://ocw.jhsph.edu/
6. Harvard Medical School OCW - http://mycourses.med.harvard.edu/public/
7. Carnegie Mellon OCW - http://oli.cmu.edu/learn-with-oli/see-our-free-open-courses/
8. Tufts University OCW - http://ocw.tufts.edu/
9. Notre Dame OCW - http://ocw.nd.edu/
10. UC Berkeley OCW - http://webcast.berkeley.edu/series.html

MIT Open Courseware -