Ask HN: What's the name of that text whiteboard web app?

[dylan_k]

I'm thinking of a web app I saw a few years ago. Essentially, the UI is a large canvas of whitespace, and the user can scroll around and insert a block of text on any point in that space. It is also collaborative so you can see others' writing in real time. An important feature of it is that the writing space is not shaped like a page or limited in width.

I can't for the life of me remember the name of it though.