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Grey literature is information not produced by commercial publishers. It includes research reports, working papers, conference proceedings, theses, preprints, white papers, and reports produced by government departments, academics, business and industry. It can be hard to track down, but the resources listed below are good starting points, and see also the links to think tank/NGO policy reports here.
OpenDOAR is the quality-assured global directory of academic open access repositories. It enables the identification, browsing and search for repositories, based on a range of features, such as location, software or type of material held. OpenDOAR has opted to collect and provide information solely on sites that wholly embrace the concept of open access to full text resources that are of use to academic researchers. Thus sites where any form of access control prevents immediate access are not included: likewise sites that consist of metadata records only are also declined. Note: OpenDOAR no longer offers cross-searching of repository contents. Descriptive directory only, not full text