Global research on Coronavirus disease (COVID-19) - WHO is gathering the latest scientific findings and knowledge on coronavirus disease (COVID-19) and compiling it in a database. They update the database everyday by searching bibliographic databases, the table of contents of relevant journals, and adding other relevant scientific articles. New research is being added regularly.
LitCovid - LitCovid is a curated literature hub for tracking up-to-date scientific information about the 2019 novel Coronavirus. It is the most comprehensive resource on the subject, providing a central access to growing relevant articles in PubMed. The articles are updated daily and are further categorized by different research topics and geographic locations for improved access.
Elsevier's Novel Coronavirus Information Center - provides latest early-stage and peer-reviewed research on COVID-19 from journals including The Lancet and Cell Press.There are nearly 20,000 related articles free to access on ScienceDirect.
Cochrane Special Collections on COVID-19
New England Journal of Medicine -2019 Novel Coronavirus (2019-nCoV) - A collection of articles and other resources on the 2019 Novel Coronavirus outbreak, including clinical reports, management guidelines, and commentary.
JAMA Network COVID-19 collection
European Respiratory Society has published information and resources on COVID-19.
Google Scholar provides access to Covid-19 Literature. Some are free and others may require subscription to the journals.