Education technology companies and organizations have stepped forward to help educators bring STEM and STEAM experiences to students in virtual ways during the COVID-19 closures. The following is a list of free resources in mathematics for PreK–12. This will be updated regularly as announcements are made. [some are relevant to lower division higher ed -ray]
https://thejournal.com/articles/2020/04/28/updated-free-math-resources-for-schools-during-the-covid-19-outbreak.aspx
