For a significant amount of time, the Fandom-hosted Psychonauts Wikia has been basically the only wiki resource for Psychonauts ever since Double Fine's official PsychoPedia (which was quite barebones but did include info even on a couple of cut concepts) disappeared.
This is, of course, complete and utter shit. I'd wish death upon Fandom but that'd mean a lot of lost information because of how many resources are still shackled to them (sometimes by force) so I can't even do that.
Also unfortunate is that the Psychonauts wikia, like many, has... dubious standards when it comes to information? It is in general quite good, more than average1 but it's fallen for many of the same pitfalls that many other wikia sites to. Poorly or completely unsourced information, sometimes downright incorrect information and of course the ever classic case of what I like to call "Wikia Trivia Syndrome" where trivia sections tend to end up as something of a dumping ground for (well meaning, but misguided) folks' personal speculation and theories as well as completely inane, insubstantial trivia which isn't at all notable. It's certainly not as bad as other sites but it's there.
Fortunately there are those who recognise this and, undeterred by Fandom's propensity to force itself to the top of searches via SEO abuse, have created an alternative wiki from the ground up, hosted on Miraheze.
This new wiki is quite barebones at the moment and there's still a lot of work to be done to flesh things out. Most pages are just structure with no content and some aren't even that. It is a start though.
Already in place are some pretty good guidelines about citing stuff and ensuring things are labelled properly in regards to canonicity. I've been helping out a bunch and with some framework stuff, creating a bunch of pages and cleaning up existing ones. And me being me, I of course cite things down to specific lines in relevant Lua files.2 It's a lot of fun, when the mood strikes I really enjoy the work that goes into writing these pages though I do suck quite bad at actual descriptions so I tend to struggle with those. Still, I'm optimistic.
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The best sourced, best cited Wikia I've ever seen is The Owl House's which always cites everything though honestly given the nature of that show I'm not entirely surprised.
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I also finally get justice in Oatmeal's page actually being called Oatmeal instead of PSI-Popper Generator, which is a name lifted from concept art relating to something that no longer actually exists in the game and the devs started calling him Oatmeal everywhere internally and unless they finally acknowledge him otherwise, as far as I'm concerned that's been his "actual" name ever since the PSI-Popper Generator's assets were recycled into becoming Oatmeal.