I am frequently asked where to get ebooks. I’ve put together a quick and handy reference for those of you hungry for knowledge and entertainment in the form of ebooks. Some are public domain, some are given away freely by the publishers/owners. Always read disclaimers and legal information before downloading.
Project Gutenberg: http://www.gutenberg.org/
The National Academies Press: http://www.nap.edu/
Free Kindle Books via Amazon: http://www.amazon.com/
Internet Archive: http://www.archive.org/details/texts
Open Library: http://openlibrary.org/
Open Culture: http://www.openculture.com/
InTech: http://www.intechopen.com/ (As of 30 Dec 2016, 2,844 Science and Technology books)
Google Books (reading online): http://books.google.com/
Amazon Cloud Reader: https://read.amazon.com/
Smashwords (Reading Online): http://www.smashwords.com/
Overdrive Digital Media Library (Service available to your local library): http://www.overdrive.com/ (Typically you need to have a library card first, then access your library online)
Once you’ve amassed a collection of thousands of ebooks, you need a program to manage them. I personally use Calibre. It is in my opinion the best way to manage, organize, and convert your ebooks. Go to http://calibre-ebook.com/ to get it.
If you are a Windows user, you can also get a portable version of the application (for USB stick use maybe) here: http://calibre-ebook.com/download_portable