Free Resources for Computer and Information Science

Archive.org
Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more.
National Digital Library
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community.
Open Research Library
The Open Research Library (ORL) is planned to include all Open Access book content worldwide on one platform for user-friendly discovery, offering a seamless experience navigating more than 14,000 Open Access books.