Grey literature is research and materials produced by individuals or organizations outside of the traditional academic or commercial publishing and distribution channels. Examples of grey literature include:
A database of reports, papers, and other resources published by NGOs, think tanks, IGOs and research centers from across the world. It also includes a directory of thousands of organizations involved in public and social policy in most subject area. A module in the Policy Commons database.
Numerous advocacy organizations also conduct research and issue a variety of reports, publications, advocacy briefs, policy documents, fact sheets and more. These websites can typically be navigated by topic, though you may also look for a Resources or Publications page as well. This is a small selection of organizations to demonstrate the breadth of advocacy taking place.