As more and more colleges and universities have shut down their campuses in an effort to curb the spread of COVID-19, education technology companies have stepped forward to help move student learning to the virtual realm. Some companies are making their paid services free through the rest of the school year; others are lifting limits to services and/or adding premium features to what’s free. By Dian Schaffhauser – updated June 1, 2020; originally published March 16, 2020.