AirConsole Is Giving Everyone Free Access to All (150+ games) of Their Video Games During Covid-19 Lockdowns:
https://www.prnewswire.com/news-releases/airconsole-is-giving-everyone-free-access-to-all-of-their-video-games-during-covid-19-lockdowns-301025571.html

All of them are multiplayer games, so you and your friends can de-stress (or stress some more?).

Cambridge made their textbooks free for everybody, but they hade to remove free access (at least temporarily) because of high demand and misuse:
https://www.cambridge.org/core/what-we-publish/textbooks

"... So today, we’re very proud to announce the launch of a new Redgate Coding Club. Aimed at children aged 6 to 14, we’ll host free online workshops every Friday teaching the basics of computing ...":
https://medium.com/ingeniouslysimple/launching-our-redgate-coding-club-for-kids-fdc29b715d04

"... To support our institutions during this challenging time, JSTOR and our participating publishers are making an expanded set of content freely available to our participating institutions where students have been displaced due to COVID-19 ...":
https://about.jstor.org/covid19/

http://www.openculture.com/2020/03/while-away-the-hours-with-a-free-h-p-lovecraft-call-of-cthulhu-coloring-book.html