Technical reports

Technical reports, a type of grey literature, are documents detailing current investigation on a technological project or theme, generally created by the organization or institution supporting the work, such as university departments, government agencies, research institutes, professional organizations, or private industry. Depending on your field, t may be helpful to identify such bodies that are likely to produce papers and documents on your topic.

Below are just some examples. You may need to search "technical report" as a keyword in some platforms. 

• Government of Canada Publications
• National Research Council Publications

United States

• NASA Technical Report Server
• NTIS National Technical Reports Library

Intergovernmental organizations 

• NATO publications
  
• United Nations Digital Library 

Companies and industries

• IBM Research
• Microsoft research blog