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I'm a simple person, I see DokuWiki and I install it some plugins. Easy to self-host on a cheap VPS (no database required!) or on your own machine (if you have access to eg.:Docker). But that's more for a general wiki kind of thing, useful but not specialized like having tools aimed for worldbuilding.
Haven't checked any of the offerings here but I'm told by a couple fellows that they've had decent story with Hammer. Would probably start looking there.
This article has comparisons between several options: https://thelinuxcode.com/best-self-hosted-wiki-software/
Seconding Fantasia Archive. It is probably the most feature rich FOSS Worldbuilding tool.
There's also Hammer which is underrated imo.
WorldLoom is another one but currently undergoing a rewrite.
Although not specifically for worldbuilding, Manuskript is another option.
Wavemaker is another option but has optional AI.
Unless there's readily available templates, you'd have to rework logseq a lot for this simple task imo. Take a look at mdSilo which is similar to Obsidian and with graph views. If you want something like Notion take a look at Appflowy or Affine but both are super into AI. If you're fine with self hosting, there's Colanode which is similar to Notion and into AI.
Wouldn't a word processor do trick? you can add links, images, refs, notes,... and have as many pages as you need (edit: and search them, add a table of content, and so on). LIbreOffice is most certainly already installed on your Linux distro and is also available for Mac and Windows.
Ehh, libreoffice doesn't even come close to what I am going for, I doubt libreoffice can come anywhere close to being used in any wiki, world building or not, transitions between pages are not seamless, and the best thing it can do is just make a document look good, which is of course useful for like all other use cases, but not for a wiki, think along the line of fandom.com or wikipedia, it would be difficult to recreate something like that with libreoffice, it simply just addresses a different use case.
I may have missed something, here so to make sure:
the best thing it can do is just make a document look good,
It can also help you write the actual book, worrying about the document 'look' aka its formatting is optional (and if done properly, using Styles, it's almost 100% automated) ;)
Do you want online or offline? Both? Need online for somethings but not all? The answers however, will only unlock more quests... Oops, I mean they will lead to more questions. Do you want to self host everything or do you need to use cloud storage? Would cloud storage be for sync and back up data for yourself, or will other people need access?
What I'm asking, to put it a different way, is what are you world building for? a novel you are writing? a campaign setting for a tabletop role playing game? Are you making a MMORPG, with its own in-game wikipedia with a group of friends or alone? Trick question, you can't do the last one alone. it would have to be called a ORPG)
Offline, with just you making the world, Zim. The interface is fairly customizable, although might seen tricky at first if you are unfamiliar with GTK and Gnome or programming in general. However, I have no usable programming skills. I can't even program the clock on my microwave. Okay, I can but I'm too lazy.
For me, a severely ADHD person, it makes it easy to organize... everything. A picture might show it better than I can describe:
I know, a screenshot of a wall of text. Not cool of me. I hope it works and the image shows or this wont make much sense from here on.
To break it down, I have the preferences dialogue open, it's on the plugins menu, you can see many are self explanatory. if you know how, you can write your own plugins. i do not know how.
However, i do know how to write simple bash commands, which can be added as custom tools and set to hotkeys. I can timestamp in EST or UTC for logging purposes with a push of a button. Your imagination is the limit! Well, plus the limitations of bash and your computer/tablet/cellphone/etc and probably like a dozen other things.
That preferences menu is open on top of a page in my notebook. The silly magician stuff. It can be ignored (and might not make sense) it is sample text. To the left, you can see my notebook, sorted by subject in my own arbitrary way. The current page is selected, the 'magic' page in the 'written' chapter.
Also I've not had problems with Joplin (which I've read is not FOSS, it does not save as .txt files) which has an Android specific App (Zim does not) but I haven't played with it enough to give a valid opinion.
Zim and Joplin both work on Windows and Linux, both can be cloud synced, like with google drive or dropbox, if you use those (I do not, I use Zim offline, except for backups). If security is a concern, Zim does not encrypt, it's .txt files. Joplin I believe does. If you backup to cloud, Joplin would be safer from theft I think. I could be wrong. theft meaning your intellectual property, i.e. possibly being intercepted and viewed online by evil hackers, possibly even copied and published under their name. I do not worry about this. I would be honored if someone tried to publish my crap without permission.
My use case is personal organizer and mind map and many other things, including a 'almost D&D' campaign setting for a TTRPG, a novel I'll never publish, pictures of things I know I'll forget... oh yeah, that reminds me, in my linked image, on the right, there's a table of contents (ToC), which gets automatically generated if you use the Header tag, for easier in-page navigation of long pages. Next to the ToC tab there's 'Attachments', this page has none. You can attach files to pages, like pdf's, images, graphs, etc and link to them from other pages in the notebook.
The only problems I've had, are likely my own fault for messing with the theme and config files a bunch. This got long. Hope it helps.
How good is cross page linking?