E-Books
4eBooks has a huge collection of computer programming ebooks
Arts & Photography
http://www.e-booksdirectory.com/listing.php?category=108
Ask Sam Ebooks has a collection of free e-books like Shakespeare, and assorted legal & governmental texts
Audio books
http://www.audible.com/t1/PBRP0329WS022409?source_code=PBRP0310WS012709
Baen Free Library is an online library of downloadable science fiction novels
Biographies & Memoirs
http://www.e-booksdirectory.com/listing.php?category=146
Blue Portal provides ebooks in various subjects
Book Yards is a web portal which contains books, education materials, information etc.
Brill Open E-Book Collection
http://booksandjournals.brillonline.com/content/books
Business & Investing
http://www.e-booksdirectory.com/listing.php?category=118
Computers Science & Internet
http://www.e-booksdirectory.com/listing.php?category=9
Darwin Online
Directory of Open Access Books
eBookLobby containing collection of various subjects
Engineering & Technology
http://www.e-booksdirectory.com/listing.php?category=73
Entertainment & Games
http://www.e-booksdirectory.com/listing.php?category=21
ENVIS Bulletin “Telemetry in Wildlife Science”
http://www2.wii.gov.in/envis/telemetry/index.html
Free Book Spot is an online source of free ebooks download with 4485 Titles in various subjects
Free Computer Books consists of a huge collection of free online Computer, Programming, Mathematics, Technical Books
Free Tech Books lists free online computer science, engineering and programming books, textbooks and lecture notes
Get Free EBooks
Globusz is a unique ePublishing house, specializing in free eBook downloads
Gutenberg- more than 20,000 public domain books that are out of copyright and also world’s greatest fiction available
Health, Mind & Body
http://www.e-booksdirectory.com/listing.php?category=83
Historical Mathematics Collection
http://quod.lib.umich.edu/u/umhistmath/
History
http://www.e-booksdirectory.com/listing.php?category=110
Humanities
http://www.e-booksdirectory.com/listing.php?category=282
Know Free is a web portal where users are able to exchange freely e-books, video training and other materials for educational purposes and self-practice
Law
http://www.e-booksdirectory.com/listing.php?category=268
Literature & Fiction
http://www.e-booksdirectory.com/listing.php?category=74
Many Books provides more than 20,000 ebooks in various subjects
Mathematics
http://www.e-booksdirectory.com/listing.php?category=3
Medical Science
http://www.e-booksdirectory.com/listing.php?category=77
Memo Ware has a unique collection of thousands of documents (databases, literature, maps, technical references, lists, etc.)
Nonfiction
http://www.e-booksdirectory.com/listing.php?category=19
Online Books for children
Online Computer Books contains details about free computer books
http://www.onlineprogrammingbooks.com/
Online Free EBooks provides various subject ebooks
http://www.onlinefreeebooks.net/
Open Book Publishers – Publishing open access academic books in the humanities and social sciences
http://www.openbookpublishers.com
Outdoors & Nature
http://www.e-booksdirectory.com/listing.php?category=136
Pure Science
http://www.e-booksdirectory.com/listing.php?category=1
Religion & Spirituality
http://www.e-booksdirectory.com/listing.php?category=65
Scribd , the online document sharing site which supports Word, Excel, PowerPoint, PDF and other popular formats
Snip Files offers you free ebooks and software
SpringerOpen books
http://www.springeropen.com/books
The Complete Works of William Shakespeare
The Online Books Page is a Listing over 30,000 free books on the Web
http://digital.library.upenn.edu/books/
The Public Library and Digital Archive
Topics like biography, fiction, games, history or tutorials etc.
Tourism & Travel
http://www.e-booksdirectory.com/listing.php?category=174
UNESCO : Open Access Publications
http://en.unesco.org/open-access/