Other Stuff

Interactive CSS Grid Generator a nice interface for drawing up some tasty CSS grids.
CSS Generators some very slick generators for CSS shapes, gradients, and more!
Dirty Markup A quick little in-browser HTML/CSS/JS/API cleaner.
Codepen Edit & preview your HTML, CSS, and JS live in-browser (instead of constantly updating your actual neocities page like me). Also so much stuff other people have made that you can "get inspired" by.
Webring List A big ol' (active, current) list of webrings you can peruse and/or join.

3D Animated Gifs Exquisite 3D animated gifs by artist Dave Stutton, free to use.
Artvee Hi-res, public domain artwork.

Photopea An in-browser Photoshop equivilent. Handy for when you forget your yo ho ho copy.
Musescore High quality music notation application, free and open-source.
VCV Rack Get into modular synthesis without the eyewatering pricetags of modular hardware.
Notepad++ A great free source code editor.
Portable Freeware A collection of free, lightweight programs of various quality and utility.
Marginalia A search engine which focuses on non-commercial content. Great way to find some cool random stuff, and also to avoid the botvomit dominating the big search engines these days.

Ishkur's Guide A family tree of electronic music
Radio Garden Tune in live to any radio station all over the world!
WebSDR Tune in to live shortwave radio all over the world! There's a bit more of a learning curve here...

Trigger Point & Referred Pain Guide Go unfuck your own myofascia right now by simply poking yourself really hard for a good 10-30 seconds in the relevant places. I can't believe this stuff actually works.

Aarix's Place