A ZUI would be great for working with the FP paradigm, but good UIs are hard to make; I think it's one of the way that NoFlow is gaining the traction it is, the UI is pretty good.
The GUI with NoFlo is one of the major reasons why this is different to the previous attempts at FBP (that and it's JavaScript). What I also love is that it's all released under MIT: https://github.com/noflo
> the UI is pretty good.
Thank you, that is encouraging. We're working to make it really good.