LitCovid is a literature hub for tracking up-to-date scientific information about COVID-19.
Outbreak Science - PreReview Articles 
To support the ongoing public health emergency response efforts, the National Science and Technology Advisors from a dozen countries called on publishers to voluntarily agree to make their COVID-19 and coronavirus-related publications, and the available data supporting them, immediately accessible in PubMed Central (PMC) and other appropriate public repositories. You can find these resources in this by following the above link.
Retraction Watch is keeping track of retracted papers about COVID-19.
You can view the regularly updated list of retracted papers at the link above.
