"LET'S SEE IF MY HYPOTHESIS IS CORRECT!"
-some Inphernal im totally not a big fan of

NOTE! might add more links/categories later, im tired rn uuoouuugh snore mimimimi
Website-Related
Sadgrl's Layout Builder
A customizable layout that you can copy/paste to your site when you're done. More details on the site itself, plus its what i used for my own site :D
What Is My Viewport
Shows you your viewport resolution, length X width. (saying this from what im assuming, w/o a google search), its specifically the resolution of your browser, excluding its sidebars/tabs/whatnot. could be useful for a handful of reasons i can't think of right now.
Flexbox Froggy
A pretty good tutorial on how to use flexbox CSS. Found it on someone else's resources page, tried it, liked it, soooo now it's here :]
Spacehey CSS preview
Lets you preview what your CSS will look like on your Spacehey profile, makes editing a lot less tedious. Pretty neat cause it updates in real-time.
Audio + Music
Online Sequencer
In-browser music making thing i use sometimes, pretty decent if you cant afford/don't want to pay for FL Studio. Admittedly, i wasn't born with the gift of creating absolute bangers.
BeepBox
Similar-ish to Online Sequencer, i haven't used it nearly as much so it's hard to describe....more retro-y??
Klattsch
A primitive speech synthesizer, a.k.a complicated text-to-speech, a.k.a bare bones vocaloid.
BetterSAM
Text-to-speech that sounds like V1 from ULTRAKILL + John Ward from FAITH: The Unholy Trinity.
Image To Spectrogram
Lets you turn pngs, jpegs, etc. into spectrograms, or visualized audio. Could use it for ARGs to hide secrets and stuff.
Misc/Uncategorized
Make WordArt
Basically type whatever you'd like, and it'll turn it into wordart on a png.
Flowey's Time Machine
A save file editor for Undertale. Pretty technical for me at least, i dunno how to mess with Undertale saves.
Clusters
Particle system/simulation thing, has presets + customizable values. It kinda looks like microscopic cells/organisms going about, with the way they interact with each other.