building a website

neocities   free webshoster with a built-in html-editor and chances to make friends!!
neocities webguide   short html-tutorial that takes less than an hour :)
nekoweb   another free webhoster focused on personal websites and friends!
jsfiddle   you can see the changes you make in your html/css files in realtime
sadgrl.online   very useful guides/templates for building your website - generally cool person
html-validator   check the html of your website for bugs
css-validator   check the css of your website for bugs
teppyslayouts   incredibly pretty templates and explenations for things like iframes =D
old web templates   A LOT of templates you can use from old websites
laika's lonely planet   some super helpful html/css tips

oldweb

oocities   big archive of websites that were hosted by geocities (shut down in 2009)
yestersearch   search engine that focuses on images of old websites
wiby   another search engine to explore the old web
marginalia search   non-commercial content search engine
brainst0rm   one of my favourite blogs (it sometimes doesn't load)
mangaplanet   an old german blog about mangas
queer zine archive   old and long forgotten queer zines
Let's Persona!   persona fan page from 1998
unicornjelly   web comic from 2000 - 2003
daranv   sora and riku shipping site

coolweb

mut.media   stylish webpage from a game dev :p
yudo.cc   a big blog with lots of yellow
miela583   what video game did i play yesterday?
districts   one rat
spacehey   social media website reminiscent of myspace
melonland   cozy forum
suzukistation   doko demo issyo fansite
nilsoncarroll   simple but effective blog
yesterweb   lots of writings and ressources about a new web
dokodemo   soft and pretty personal blog
rgbteahouse   archive of this persons drawings
cinni   personal blog and ressources, very sweet. .
indygiertz   another personal blog and ressources, very .. COOL :O
000010   a warm and mellow blog <3

resources

dafont   huge platform for fonts
phonetones   big and immediate archive for old ringtones and phone sounds
cs50   lecture about coding (helped me to understand how programming works)
oekaki-tips   how to draw pictures with your mouse! (in german)
sozialreform oder revolution?   epic text to grow anticapitalist by rosa luxemburg
anilinks   list of anime-websites
gamesdatabase   i thinke very game is on here?
replacementdocs   scanned manuals from videogames
obby.dog   cool ressources for your website
cursors-4u   a lot of custom cursors (updated their page recently but it's still a rich archive)
gifcities   find old gifs!
99gifshop   even more gifs WOW
mf2fm   very fun effects for your website....
atabook   guestbook-tool!

anime

animelyrics   a big nice fun page of countless lyrics of anime songs
absoluteanime   sort of incredible archive for everything anime
minitokyo   high quality anime artworks and wallpapers (there's also fan-made stuff!!)
watch cartoons online   a friendly anime and cartoon streaming site :)
ichigos   get sheetmusic of your fav anime song
the anime primer   another handy list to research anime
animeadmirers   another another handy site to research anime (it's still active!)
animemusicvideos   one of the oldest and most active community and home for amvs

games

withinmyworld   animal crossing theories
newgrounds   platform for webbased games and more (also serves as an archive)
megaten   documentation of almost all shin megami tensei and persona games
how to make good small games   read this if you struggle making games
noclip   fly through 3d-environments of many games in your browser!!
melodicambient   blog from a game-dev
joeyschutz   another blog from a game-dev!
vgmuseum   find screenshots and infos about old games
languageatplay   german platform for papers in game studies and other texts
boktai   website about boktai :)
vgperson   translated rpgmaker games

emulation

vimm   classic site to get ROMs from
atabook   incredibly useful database to get even more ROMs
retroarch   emulator for most consoles
pcsx2   good ps2 emulator

homebrew

hack your 3ds   3ds homebrew
hack your wii   wii homebrew
hack your wiiu   wiiu homebrew
hack your switch   switch homebrew

get your media

annas-archive   get every book and article for free
archive.org   you can find anything you're thinking of here
myabandonware   abandoned games to download for free (for example wetrix)
rippersanime   get music, movies and more
soulseek   share your music library and downlaod others
archive.is   read paywalled newsarticles

alternative game engines

love2d   game framework based on lua!!
pico8   a fantasy console (also based on lua!!)
pico8 tutorial   tutorial for pico8
bitsy   browser based game engine
godot   (it's one of the most well known engines but i wanted to include it bc it's open-source
gd script tutorial   fun tutorial to learn how to make games in godot :)
nswengine   to make text-based spatial games
enginelol   collage-game-engine in browser
electric zine maker   make your own digital zines

fun toys

rw-designer   make cursors, icons and more
pokemonbattlecreator   battle mock-up maker :)
pokecard   make a pokemon card!!!
pokecharms   trainercard maker
blinkies.cafe   create your own blinkies
ezgif   turn videos into gifs and edit them online
whopostedwhat   search for old facebook posts
backloggd   nice way to backlog your games and find friends
strudel   make code-based music in broswer!
gba / ds / 3ds templates   templates for game cases and cartridges
wigglypaint   cool painting software =D

misc

sandspiel   fun sand game :p
otakuworld   very fun old games and tools
radiosega   internet radio that just plays songs from sega games
nightcoreuniverse   nightcore forum (this thread explains where nightcore comes from)