A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Bookstack is a really nice wiki/documentation tool.
You may also like wiki.js or even just storing markdown files in a git repo. Lately I've been using Obsidian to manage some notes about servers, but am thinking of going back to bookstack to "publish" docs for others.
Bookstack is absolutely great. I have all my selfhosting knowledge written there from when I started 2 years ago. It is so great that I've started documenting stuff for other hobbies and for work.
I know this is the self-hosted Community, but I would use GitHub for that use case. I like to keep notes and links in plaintext files, and then store those instruction documents together in a project with any files needed for the project (like config files), that can then ask be easily pulled to the device you're working on. You can also get fancy and store the instructions in batch files that actually carry out the steps for you.
Of course something very similar could be achieved with a self-hosted git instance, but I like using GitHub because I like having the web interface and Pages option when those are relevant.
I just have a bunch of text files (org) and sync them on all my computers with Syncthing. Works great so far.