A collaborative editing tool, supporting rich text, named contributors and chat. Our current pad is here:
https://yourpart.eu/p/digizeit
In lieu of a better solution, we could try to meet there as a low-budget online classroom for our Tuesday sessions! I'd prefer we don't Skype, since we have all Skyped before and should be trying to find novel/scalable solutions.
We may use this pad for some class activities, may not, time/corona will tell. You might find etherpad useful for something unrelated to digizeit---since it's also easy to make a new pad, go ahead, this is encouraged!