Roam is Roam Research [0] which is a paid web-based product. It's relatively new. There are also some open source alternatives like Obsidian.

Because of it's popularity someone created an org-mode package called org-roam [1] that does some of the things that roam does, but in emacs. These are not officially related though.

[0] http://roamresearch.com/

[1] https://github.com/org-roam/org-roam

I was interested when you mentioned Obsidian was open source, thinking they must of changed that since the last I read about it. But I looked it up again and it's not, it's still proprietary.

Oh ok, and it can be used with VSCode somehow? Or were you talking about unrelated things?

Those are unrelated, Roam is just a web-based SaaS app.