There are a ton of options listed on the Awesome Selfhosted list. I’m on the search for a FOSS option that I can use to document my homelab and personal tech projects.
Right now, I’m leaning towards wiki.js
Edit: similar question
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DokuWiki for simplicity. Everything is a text file that can just be copied to a web server. It doesn’t even require a database. And since all the wiki pages are plaintext markdown files, they can still be easily accessed and read even when the server is down. This is great and why I use DokuWiki for my server documentation as well.
This. For exactly this reason.
I was going to say that the big downside to that would be a lack of any kind of version control, but I guess if you need that you can always use git and just commit changes there and (optionally) push them to a repository somewhere.
Doku still has the typical wiki style version control. It uses other text files to keep a changelog without cluttering the markdown file.