open source - drawing/online app

[bruce]

Hey guys.

I know, this has nothing to do directly with Fed. However, I'm looking
for a good/free online app that can be used to do network diagrams.

I was really into draw.io, until it appears that I can't copy a item
from one document to another within the browser. IE, if I create a
block in tab1 in the browser, and do a select/copy I can't then do a
paste of the copied item to the new tab/doc.

draw.io is good, as you can create as many/complex diagrams as you
want, and save them to the cloud/local. If I could solve this minor
issue.. I'd be good to go!

If anyone has a good/free online soln, feel free to let me know!! (Or,
if you know how to solve the issue I mentioned. Couldn't find anything
via searching, that worked for me. -- btw, I tried
Firefox/Safari/Chrome with no luck)

Thanks