A wonderful Neocities website that hosts a ton of textures (3867 of them, as of writing) and even has a bunch of preview functionality!

A ton of hi-res photo textures, including architectural features, materials, nature elements, and backgrounds & landscapes. They're extremely well-categorized, and although maps and higher resolutions are paywalled, this is only 13 euros a year and they still have a ton of freebies. They also use '^-^' in their donation page so you know the money is in the right hands.

A big variety of free textures free to use for personal and commercial purposes. I like to scale them down for PSX texturework.

They have a big library of high quality, seamless PBR materials. Their pricing scheme is a bit evil though; when you subscribe you get an amount of credits per month, but unused credits don't stack and disappear when your sub ends.

This internet archive item is, as far as I know, all that remains of GRSites' many resources. They also had stuff like fonts and neat tools like a logo maker, really sad that they shut down ;-;

A ton of free textures. Also some tutorials and tools but they're centered around Adobe products like Photoshop and After Effects.

Blogspot page with a ton of photo textures, you can either manually download them or get a big pack with all of them prepacked for $14.99.

Has... uh... free sounds.

Hosts a ton of modules and an active forum of trackers; They're great!

Has... free music... duhh.

Pretty good loops, samples, and synth presets.

A collection of free (game) sound effects created by the goat Taira Komori.

All-time breakbeat bundles.

Free stock photos and videos, I'm pretty sure this is where a lot of slop-producers get their random stock footage from, which is funny to me.

Primarily deals in icons in a variety of filetypes, their other stuff can safely be ignored, it's a bit shit and may be AI generated.

Sells really cool fonts and illustrations. Sadly they, like textures.com, have a shitty subscription pricing scheme, but they do have a small selection of free stuff.

GIFCities bitch GIF GIF cities bitch (you can look up GIFs here that were scraped and preserved by the wayback machine).

More of a -curated- collection of GIFs, moreso part of the web1.0 revival movement.

Has photo scan, 3D, and 2D assets of humans! A bunch of them are free, and they include things such as unwrapped face textures, (retopo'd) head and body scans, and reference photos.

A ton of free assets for game development, stuff like textures, models, sounds, fonts... Make sure to credit as is proper.

Basically a Creative Commons search engine that automatically directs you to material that has a CC license on different platforms, such as YouTube or Flickr.

Royalty-free (vector) images, videos, music, sound effects, and GIFs.

A wiki/forum dedicated to creating and ripping video-game content, including sprites, models, textures, and sounds from all sorts of games and console eras. They're fun to use as placeholders.