Resources

Website Coding

W3Schools - A great resource for learning HTML/CSS/JavaScript coding.

CSS Gradient Maker - A tool to generate CSS gradients.

Font Awesome - A toolkit that lets you add icons to your site with code.

Hover.css - A collection of hover animations using CSS.

Border-Image Generator - A tool to generate borders out of any image.

RV's Free Javascript/DHTML Effects - A bunch of cursor and text effects.

Tippy.js - A super versatile tooltip creator.

Making Assets

Dithermark - A website for dithering images.

Ezgif - A website for gif/video creation/modification.

eLouai's Candybar Doll Makers - A website for creating pixel dolls (Archived on the WayBack Machine so some images don't load, but it's still very functional)

Picmix - A website for creating digital collages.

patternico - A website for creating seamless tiled backgrounds.

Asset Collections

Cursors4U - Huge collection of cursors.

The Rainbow Locker - A huge, curated collection of sites for graphics.

Pixel Safari - A large collection of pixel graphics.

GifCities - A site that lets you search archived GeoCities pages for GIFs.

Web Badges World - A collection of tiny web badges ().

Pixel Sea - A site that let's you search through icons and buttons
(note: page auto-plays sound).

PC98 Images - A catalogue of PC-98 games, with ripped screenshots, as well as some games for download. (note: some games contain adult content, but you can filter them out)

The Sounds Resource - A site of ripped video game sounds.

The Spriters Resource - A site of ripped video game sprites.

Userbars.ru - Userbars.

Habbo Furni - Every Habbo furni item (right-click images to save).

HabboAssets - More Habbo sprites.

Misc.

Web Design Museum - A website that shows snapshots of popular websites throughout history.