The IEEE Xplore digital library is a powerful resource for discovery and access to scientific and technical content published by the IEEE (Institute of Electrical and Electronics Engineers) and its publishing partners. - From Publisher
Access to all ACM journals and magazines online, as well as conference proceedings; more than 750,000 pages of downloadable text. In addition, it has non-ACM journals and proceedings available from affiliated organizations, such as the Computing Research Repository (CoRR). Updates: varies.
O’Reilly for Higher Education covers business and technology resources with more than 46,000 ebooks, 30,000 hours of video, learning paths, case studies and playlists.