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"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... articles in PubMed." Maintained by the National Library of Medicine.
"WHO is gathering the latest scientific findings and knowledge on coronavirus disease (COVID-19) and compiling it in a database. We update the database daily from searches of bibliographic databases, hand searches of the table of contents of relevant journals, and the addition of other relevant scientific articles that come to our attention."
This database "brings together trusted content from journals, preprints, conference proceedings, dissertations and more related to COVID-19 and other coronaviruses. This database brings together not only content from open-access journals, but also pre-prints and additional content being made freely available by major publishers from around the world."