Diagram editor

A vi-inspired diagram editor, with (latex) labelled nodes and edges, tested with Firefox, written in Elm (see the code on github). Higher cells are supported. It is far less sophisticated than Quiver, but one useful feature (if you don't know the final shape of your diagram) is that you can draw anywhere, not just on the grid (whose size can be later adjusted).

For a LaTeX export, first export to Quiver (beware that vertices will be snapped to the grid in the process).