I use Miro quite a lot in my work for workshops. It’s really an amazing tool. However it just dawned on me that there isn’t really any open source alternatives..or none that I have found.
I did find quite a nice alternative milanote, but it isn’t open source and feels more for personal usage.
What white boarding collaborative tools do you use that are open source, if any? And what are the chances to get one going? 
I see excalidraw frequently used in open source projects
Wow this looks great and privacy driven. Love it and will definitely try it out. Thanks!
It’s a few years out of date but I used to help maintain this repo for open source alternatives: Whiteboarding Applications / Miro / Mural / Milanote / InVision Freehand · Issue #321 · junaid33/opensource.builders · GitHub
Doesn’t look like there’s a lot of stuff. The website alternativeto has more stuff though: https://alternativeto.net/software/miro--formerly-realtimeboard/?license=opensource
Hello,
Wouldn’t PenPot.app’s collaborative features serve this purpose?
Could try AFFiNE (: I’ve used it with friends to collaborate for a game jam.