Open Access – E-books

1ApressThe growing demand for open-source content and open access publishing options in the tech community has led Apress to offer authors and publishing partners the option to publish open access books.
2BookboonGet free access to hundreds of free textbooks written by professors from the world's top universities, all on one easy-to-access online e-book platform.
3Book onlineListing of over 2 million free books on the Web.
4Computer BooksLinks to free computer, mathematics and technical related books all over the world.
5Directory of Open Access BooksProvides a searchable index to peer-reviewed monographs and edited collections published under an open access license, with links to the full texts of the publications at the publisher's website or repository.
6Free Book contains links to thousands of multidisciplinary e-books available for free.
7Green Tea PressAll of our books are available under free licenses that allow readers to copy and distribute the text; they are also free to modify it, which allows them to adapt the book to different needs, and to help develop new material.
8JustFreeBooksWith JustFreeBooks you can find all sorts of free e-books for your Kindle, Nook, or tablet: public domain texts, open books, free audiobooks and more. 
9Many BooksOne of the best free e-book collections of light reading materials. Browse through the most popular titles, recommendations, or recent reviews from our visitors.
10National Academies PressOffers more than 8,500 titles in PDF format on a wide range of topics in science, engineering, and medicine, providing authoritative information on important matters in science and health policy. Almost all of these PDFs can be downloaded for free by the chapter or the entire book. See About PDFs for more information on accessing their digital content.
11OBOOKOA unique collection of free books are available permanently and will download straight to your phone, tablet, laptop, or desktop computer in your choice of pdf, e-pub or kindle formats.
12Online Programming BooksThis site lists free e-books related to programming, computer science, software engineering, web design, mobile app development, networking, databases, information technology, and more which are provided by publishers or authors on their websites legally.
13Open Book PublishersTheir books are published in hardback, paperback, pdf. and e-book editions, but they also include a free online edition that can be read via their website, downloaded, reused, or embedded anywhere.
14Open CultureAbout 200 free textbooks written by knowledgeable scholars on various disciplines.
15Open LibraryOpen Library is an initiative of the Internet Archive, a 501(c)(3) non-profit library of Internet sites and other cultural artifacts in digital form. Open Library contains information about books. Internet Archive hosts a collection of digitized books. Open Library's universal catalog provides links to discover, borrow, and read from the Internet Archive's collections. Your Internet Archive account can be used to sign-in to Open Library.
16OpenStaxAccess to these high-quality textbooks is game-changing for students.
17Open Research LibraryThe open research library (ORL) has a wide range of multidisciplinary e-books including fictions which is offered on a user-friendly discovery platform, offering a seamless experience navigating more than 20,000 open access books.
18PacktA library of free resources provided on behalf of Packt Enterprise.
19PDFDRIVEPDF Drive is your search engine for PDF files. More than 3, 00,000.00 e-Books to download for free and collection is increasing every minute.
20Realtime NexusRealtime Nexus Digital Library is the go-to for IT professionals and executives, offering free access to eBooks, article series, podcasts, guides, videos, and other resources.
21SYNSFUSIONFree Access to 170+ e-books from the “Succinctly Series” which explores the latest trends in software development, data visualization, and data science.
22WileyA library of free resources provided on behalf of Wiley.