yume nikki online : play YUME NIKKI and all of it's fangames online ! can play online with others or solo.
the ghost in my machine : a site focused on discussing urban legends, creepypastas, those cary ritual games, etc. i've been frequenting the site since the 6th grade !
zombie hip-hop : recreations of the gorillaz official website during their phase one and two eras. plenty of interactive goodies with tutorials on ho to get it all running !
lomando : a nice horror game site thing. warning for jumpscares, flashing lights, sudden loud noises, etc. lots to explore !

town of silent hill : archives of official Konami SILENT HILL sites for preservation purposes. many different languages ranging from EN to JP, FR to SP, etc.
cookie clicker online : literally just cookie clicker but online ! i'm pretty sure you can use cheats as well but hey you didn't hear it from me.
eyemaze : lots of fun little games where you click different things to let them grow ! used to play these games all the time back in elementary school :)

thirty dollar website : that one meme website you can make music on via a soundboard of memes.
windows media player skins : an archive of different windows media player skins you can download ! i personally have the noodle gorillaz skin and i love it :)
ipod.js : link your spotify to this site and emulate listening on an ipod touch ! i don't use spotify though so i haen't gotten around to using this myself.
random jerma moments : gives you a random jerma clip at the click of a button ! the future is now.

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matias nsfw : not actually nsfw just trust me.
yyyyyyy : visual internet vomit.

w3schools : ol' reliable. has everything you could possibly need to learn the basics of html & css.
codepen : the program i personally use to make my website ! you can sign up for free !

js paint : an ms paint emulator online !
kidpix : a kidpix emulator online !

google drive graphics : a google drive full of different graphic resources from backgrounds to gifs and more.
gifcities : a treasure trove of gifs from the geocities era of the 2000's !

adopt-a-censor : adopt a censorship panda for your website.
web neko : have a cute lil cat chase your mouse around your site !