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I would like to know if NoFlo is being bootstrapped, i.e. are NoFlo developers actively using NoFlo to further develop NoFlo?

Some video of this type of development process would be an amazing proof-of-value.

The UI is currently written in JS with Backbone. Once it reaches a usable-enough state rewriting it in NoFlo is high on my list.

I seriously doubt it. NoFlo is not a language, it's a DSL on top of some another language. There will always be NoFlo.core and NoFlo.libs.