These links will take you directly to the portions of databases that contain materials relevant to Computer Science. However, this is by no means an exhaustive list. Feel free to explore the General Collections to find additional resources.
These books have been reviewed by faculty from a variety of colleges and universities to assess their quality; they can be downloaded for no cost, or printed at low cost. All are either used at higher education institutions, or affiliated with an institution, scholarly society, or professional organization. CC BY 3.0
Contains free eBooks and textbooks that can be downloaded as a pdf, no registration needed. These books cannot be altered, but can be freely printed, shared, or embedded in non-commercial ways. They are intended only for individuals, colleges, and schools. Site-Specific Licensing.
Free Computer Science Textbooks, part of their larger collection 200 Free Textbooks: A Meta Collection. Also see their online collection, 1200 Free Online Courses from Top Universities. Licenses vary. Verify individual items.
A Pathways portal of the National Science Digital Library and funded by the National Science Foundation. CSERD aims to help students learn about computational science and to help faculty and teachers incorporate it into the classroom. Site-specific license.