I also searched #Wikidata but no result was found.
If a software isn't too notable there are chances that it fits in Wikidata.
From your quote:
"As you mentioned there is etherpad but also excalidraw that does collaborative work. And I imagine one could create mindmaps with it."
This is the context which I interacted through. If you hadn't mentioned me I guess I'd continue doing whatever I was doing.