Just heard of draw.io for the first time. The product seems extremely polished. And it's free. And it's open source. And they have a non-trivial team. And they don't force you to sign up. And they make money. (I understand as a paid addon in Atlassian.) I'm buffled. Very interesting.
...and they are competitively priced for Atlassian as well. We migrated away from Gliffy to draw.io on price alone. If Gliffy's pricing had been near draw.io, we would have stayed, but it was >2x higher.
