In response to the number of states, districts and schools closing, education technology companies have stepped forward to help educators reach students in virtual ways. In many cases, the companies are making their paid services free through the rest of the school year; in other cases, they're lifting limits to services and/or adding premium features to what's free.

https://thejournal.com/articles/2020/03/13/free-resources-ed-tech-companies-step-up-during-coronavirus-outbreak.aspx