Update (June 2021): This guide was created in April 2020 to provide information about resources that have been made available by publishers and vendors in response to the COVID-19 crisis. Access to many of these resources has now expired, but this guide will be maintained at least through the summer of 2021 to keep track of those that are still freely available. Please note, however, that we are no longer actively adding resources to this guide.
Some resources are offered for free for a limited period of time; others require authentication using the VPN or a proxy server and are marked with a key icon: . (If you need help setting up the VPN/proxy server, check out these remote access tutorials.) This guide will be continually updated for the duration of the crisis.
If you are looking for ebooks, start with this helpful guide to finding ebooks or watch this short video tutorial.