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I'm working on Storytella[0] which is a writing app aimed at self-publishing authors. I'm trying to bring more developer-like tools to authors in a simple way, so there's an entity system (think, database) and entities can be inserted into body text using an IDE-style context menu. [0] https://storytel.la/
That's an awesome idea.
Thanks! It's been really interesting building something that has been so useful to me, and hopefully it will be useful to others too.