Open educational resources (OER) are free, openly licensed educational resources, including textbooks, videos, tutorials, and more. Users of OER are permitted to use, adapt, and redistribute the material with minimal restrictions based on Creative Commons licensing. See below for specific examples of OERs suitable for the study of Sociology.
There are many OER repositories to search from; a curated list of the most prominent databases is below.
Open Access books don't have the same adaptation options of OER, but they are free to read and download and are high-quality, peer-reviewed scholarly material suitable for learning and research. To find OA books search the Directory of Open Access Books (DOAB). For a selection of OA books relevant to Sociology, please see the sources below.