I don't see anything about pornographic content on Miraheze's terms of service, though I suspect that something Reddit don't allow wouldn't be welcome in many other places either. You can make wikis there inaccessible to the public if you want, too. But each wiki needs to be approved by their staff before it's opened, so you can explain in your application exactly what you want to put there, so that if it's something they don't want they'll presumably just reject it before you put in the work.
From the comments section, I'm assuming that you are looking for a mapmaking tool. I think that I may have a good program.
It's a mapmaking tool called Wonderdraft. From what I've seen, its somewhat similar to Inkarnate, except it works as a program on your PC, and it has a one-time fee, with 2 optional assets you can buy from the developers.
However, I do admit that the base program doesn't have many options for more customization. But the Wonderdraft community also create their own free assets which you can install manually or using a community-created program called Mythkeeper.
Wonderdraft costs only 30 dollars. You can find it here.
They also have subreddit if you are interested: r/wonderdraft
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Or if you are looking for a program that specializes in documenting facts about your world, I'd recommend Campfire pro.
Campfire Pro can document different aspects about your world and lore (It's used by storywriters as well, so I use their story timeline feature for lore timeline). Based on what I've read in the comments, I think that the best features this program has for you is a map managing tool, where you can import images of your maps and mark specific locations, and give details about it, and the worldbuilding pack which contains the ability to create species (it also has other features, but I did see you mention species).
However, the big downside is that it's very expensive. The full version (the base program and worldbuilding pack) costs $75, with a one-time fee. Besides that, there is a free 10-day trial if you wanna check it out without the worldbuilding pack.
You can find the site here.
They also have a subreddit if you wanna check it out: r/CampfireTechnology
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I hope that, at the very least, one of these programs may be helpful for your worldbuilding needs.
Honestly, I don't know how deep they go. There are sometimes where it randomly goes on.
The book I like for that is "The Science of X-Men" as it details some of the more scientific aspects of different abilities. That might be more helpful for you :)
https://www.amazon.com/Science-X-Men-Linc-Yaco/dp/0743487257
Okay, so here's the website - Obsidian Markdown, just to give them a chance to explain themselves lol. The platform is free and versatile, with the option to pay for in-house cloud services and webhosting.
It's a writing platform, that heavily emphasizes these principles: Each note has one idea, and notes always connect to other notes. The result is an incredibly interesting creative writing experience, where you can freely write about a topic you're interested in right now, and you just need to connect it to something anything you've written about before. Easy enough, Nation -> King -> Event -> Person -> Object -> Friend -> Parent etc etc.
I know this all sounds vague to you now, but I urge you to try it out (and one day you'll see how hard it is to describe Zettelkasten to your friends lmao).
This week I was writing about a god of death, and needed a "library" and turns out I have several libraries that I personally had already written about in the past few months, while developing a couple different nations in my world lol. Boom, my god of death has a whole Keeper's Order now, and that library just got a secret undertone, much more than just a library lol.
Imagine having a wiki from your own creative writing. Maybe that's what it's like when your vault is mature lol.