Although I find google search (and google scholar) particularly useful in identifying books or articles available to download, I keep bumping into other websites.
This is a placeholder. I'll add links as I come across them. Note that I've not checked all these websites.
LIST
Online Library of Liberty: http://oll.libertyfund.org/
Mises Literature Library: http://mises.org/Literature/Index
Gandhi's collected works: http://www.gandhiserve.org/cwmg/cwmg.html
Vivekananda's collected works: http://www.ramakrishnavivekananda.info/vivekananda/complete_works.htm
Bookboon: http://bookboon.com/
Books Should Be Free: http://www.booksshouldbefree.com/
Goodreads: http://www.goodreads.com/
Internet Archive: http://archive.org/
Project Gutenberg: http://www.gutenberg.org/
Free E-Books.Net: http://www.free-ebooks.net/
Open Library: http://openlibrary.org/
Free Books: http://www.ebooksfree.in/
Planet EBook: http://www.planetebook.com/
Adelaide University: http://ebooks.adelaide.edu.au/
Free Classics. Classicly: http://www.classicly.com/
Get Free Books: http://www.getfreeebooks.com/
Many Books.Net: http://manybooks.net/
Open Culture: http://www.openculture.com/
Google Books: http://www.getfreeebooks.com/
Free Books For Doctors: http://www.freebooks4doctors.com/
Book Finder: http://en.bookfi.org/
KINDLE
Kindle popular classics: http://www.amazon.com/s/?node=2245146011
SUBSCRIPTION MODELS
Questia: http://www.questia.com/
Laissez Faire Books: http://lfb.org/
PAID VERSION
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List of online places to download free books http://t.co/94P72d3o
List of online places to download free #books http://t.co/4ZuK9DWz
Ambedkar’s collected works – http://www.ambedkar.org/ambcd/