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Nisus' killer feature back in the day was that it was a word processor that supported regular expressions for find and replace, which at the time were only found in text editors for writing code. But yes, LibreOffice supports that now.

I think this is a lot more similar to Scrivener, where it’s designed to manage huge, complicated docks in multiple sections.

Sure, today, but this was originally released 11 years before OpenOffice was open sourced.