Called “Versal,” (see versal.com) it is part of the Google Partner for Education program, which means it can be used with the Google ecosystem of apps.
Versal has a wide host of gadgets, and can also embed third-party educational tools, including those often used in special education, such as GeoGebra and StoryboardThat. For a list of compatible tools, follow this link and scroll to the bottom of the page.
Versal includes a list of pre-made courses. You could also get paid to create a course, as long as you agree to share it for free. For details, see The Versal Foundation page (versal.org).
To find out more about Versal, take an online course or join one of the “How to use Versal in the Classroom” webinars from 3 to 4 p.m. ET Monday, May 11 or May 25, or 7 to 8 p.m. ET Wednesday, May 6, May 20, or June 3.