sadgrl.online has a ton of tutorials and is a great starting point for pretty much anything related to making your own website on Neocities or elsewhere
Neonaut has a whole lot of resources! No, seriously, I can't do this site justice, it has so much.
foollovers, a Japanese website with tons of images to deck out your site and some bases/templates.
glitter graphics, absolutely iconic. I have way too many things from this site downloaded.
Melon King's textures, there's so much stuff here.
Repth's themes! When I first made my site, I used Theme 12 for most of it.
sadtheme on tumblr's small pixel collection. These are great for favicons!
ohpixels' pixel collection! A staple of my kinnie tumblr days.
pixel-soup's pixel collection! Another staple of my kinnie tumblr days.
pixel-world's pixel collection! This one's still active, too!
Khan Academy's computer programming course, this was how I first learned HTML/CSS properly!
sozai.pooftie.me, has a whole lot of pretty lace stuff.
emoji.pooftie.me, a bunch of pastel emojis for your site.
Fair warning, a lot of these are super dense!
TLP, but an easier to read nested version of the Ogden/Ramsey version.
Last TLP link, audiobook version of the Ogden/Ramsey translation.
Now for non-TLP stuff:
The Ludwig Wittgenstein project! It aims to make his works available in multiple languages for free. (they're currently looking for volunteers, offer to help out if you can?)
"Wittgenstein: Reality is Shaped by the Words we Use" on fs.blog. I found this really helped me conceptualize what Wittgenstein was trying to say with regards to the Tractatus. It sort of made everything click! Maybe this will help you if you're having problems understanding it?
"Wittgenstein’s Philosophy of Mathematics," from the Stanford Encyclopedia of Philosophy.
"Kant, Wittgenstein, and Transcendental Philosophy," an archived paper by Robert Hanna from the University of Boulder. An interesting look at Kant and Wittgenstein's works.
NSFW, The Asenheim Project, play old visual novels online!
Locale Emulator, useful for if you need to run a game using Japanese locale but don't want to change your locale for whatever reason. I used this specific one for years.
M88, for running NEC PC-88 visual novels.
Neko Project II, for running NEC PC-98 visual novels.
NSFW, a big-ass collection of PC-88 games.
NSFW, a big-ass collection of PC-98 games.
NSFW, a collection of English-translated PC-98 games.
NSFW, another big-ass collection of PC-98 games, but more easily sortable and with a section of non-adult PC98 games!
Shameless self-promotion for my own guide to running VNs lol
VGPerson's game translations! All are free.
Lain PSX game, pretty stright-forward.
AGT Team's Patch masterlist! They're cool, they translate a bunch of anime games, including some visual novels.
Moriya Shrine, a central hub for Touhou stuff! If you want to try getting into Touhou but don't know where to start, start browsing through here.
Gensokyo Radio, radio station for a bunch of fan-made Touhou remixes.
NSFW, Denpa Archive has a bunch of cool scans and other denpa-related stuff!
Internet Archive's flash game collection! (some of these may be NSFW)
Internet Archive's MS-DOS game collection! (some of these may be NSFW)
DOSBox, so you can play MS-DOS games!
uBlock Origin for Firefox! Love yourself, and switch to Firefox.
More to be added later. Please let me know if you want me to remove you or if one of the sites goes down.