While this seems like a relevant thread, I’ll drop in our app too. Our approach is wide enough that “reactive rich text” like Patera is a subset of our functionality. See our Twitter feed for recent examples: https://twitter.com/InflexHQ

Our documentation and discoverability is currently zero, and the rich text feature is in development, but another space to watch if you’re into this kind of thing.

I also added a bibliography page, so you can see other apps in this space: https://inflex.io/blog/bibliography (“Vaguely similar market products”)