This self-hosted Microsoft Word alternative isn't for the faint of heart, but it's better than every other out there
You can self-host Overleaf, and it's how I make all of my documents.

We're all familiar with Microsoft Word, Google Docs, and the various offshoot free and open-source tools that allow you to do the same thing but in your own controlled environment. However, many aren't familiar with LaTeX, which can essentially be summed up as a programming language that you can use to make documents. LaTeX is so powerful that many academic papers are written using it, and some universities require it for a dissertation or thesis, which was the case for me. Overleaf is by far the best way to create documents in that format, and you can self-host it for free.