Grey literature refers to information that is unpublished or not published commercially. Examples include policies, reports and publications from the government and other official organisations.
Associations, charities, organisations and societies
Websites from associations, charities etc. can be a good source of grey literature such as official publications, reports and policy papers.
Resource collections, hubs and portals
Many organisations place all their research and publications on one page of their website. These are often referred to as research collections, hubs or portals.