[ned]

Super interesting.

How does this compare to Xopus? https://xopus.com/

Of course, Xopus is closed source, so that's a big difference already.

[holloway]

I'm not really that familiar with Xopus so I can't really comment. Judging from the screenshots (E.g. DITA) it looks like it has a lot of per-schema customisations which my software doesn't have.