The Boring Stuff™
Mozilla Developer Network
It's genuinely undeniable how useful this website is. Vastly prefer this to w3school's documentation. They provide great examples illustrating CSS properties and HTML tags. 10/10
WebAIM WAVE
Dead simple accessibility checks on websites. If you're into trying to make websites accessible, this is the perfect resource for you.
Graphix
nuthead's Scanline Crusher
If you couldn't tell already, a majority of this site relies on static.gif. A 128x128 gif that's just 8 frames of static. This was made using paint.net with a 128x128 black .png, the scanline crusher webpage and...
ezGIF GIF Tools
ezGIF's GIF maker! Nothing much to say. Just some really useful GIF manipulation tools.
OneShot Sprites
These were drawn by the amazingly talented @nightmargin for the game OneShot! (who could've guessed) Although I will add they were happily ripped by the contributors of The Spriters Resource.
Stamp(s)
Citation needed stamp sourced from here. Warning: very pink
Fonts
Ubuntu Mono
The font family I use on here. 'Nuff said.