IEEE is making COVID-19 related papers in IEEE Xplore available free of charge (i.e., open access) for the period of time that the pandemic exists.
One might ask, what does COVID-19 have to do with IEEE? Well, IEEE Xplore contains more than 5 million documents. Upon a search on terms such as coronavirus, pandemic, SARS, MERS and similar terms, 420 hits resulted!
This action is in accordance with IEEE's tag line, "Advancing technology for humanity."