It hasn't gotten any love via Show HN, but it's relevant to the thread, so :)
Basically I wanted something sort of like Trello, but more geared toward Knowledge and Content management and collaboration. I was unaware of the existence of Google Keep at the time, but it does look vaguely similar, doesn't it?
Oh yea, example (read-only) board: https://app.contabulo.com/boards/a5e413d1-8fe3-4b42-a8f1-b4f...