W3Schools - Your best friend when starting off learning HTML and CSS
Web Design in 4 minutes - Interactive crash course in building a website
Mutant Standard - Experimental emojis that are an offshoot of Unicode Standard emojis
HTML Color Codes - Color picker for all your color code needs
Image Color Picker - Upload an image and use the eyedropper to grab HEX or RGB codes
3D Gif Maker - Make a gif of your image on a rotating cube or whatever
Dither It! - Image dithering tool
Retro Image Tool - Another image dithering tool
GifCities - Old web gifs
Profile Resources Masterpost - Gifs, stamps, blinkies, backgrounds, & more
Pattern Cooler - Free, seamless pattern backgrounds that you can edit
PicMix - Blingee alternative
Cool Text - Generate flaming text and other animated text
Soulseek - Free file sharing network. It's mainly for sharing music, but you can find a little bit of everything on there.
Project Gutenberg - Free books
Myrient - Video game preservation site where you can download ROMs for free (without ads)
Playscii - Open source ASCII art and animation program
HandBrake - Free, open source software for converting videos to other formats
12ft - Bypass paywalls
Terms of Service Didn't Read - Gives you a summary of terms of service, plus gives each site a privacy rating
Falling Fruit - A community made map of edible plants
Find a Grave - Cemetary records. Great tool for looking into genealogy
Spot The Station - Get alerts for when you can watch the International Space Station pass overhead (it's more often than you think)
This To That - How to glue things to other things
Hero Forge Custom Miniatures - Online tool where you can create customized 3D miniatures of your fantasy characters
Star Trek Repository - A google drive of (nearly?) every Star Trek episode throughout all the series
Mapcarta - Explore the world
Atlas Obscura - Obscure travel destinations
Roadside America - Obscure travel destinations pt. 2
Radio Garden - Google Earth, but wherever you zoom, you get the radio station of that place
My Retro TVs - Channel surf the past, from the 1950s to the 2000s
AllAboutFrogs.org - Frogland
A Guide to the Orders of Trilobites - All about trilobites
HORG - Holotypic Occlupanid Research Group: A Database of Synthetic Taxonomy
Death Generator - Generate fake screenshots from games
Mystery Flesh Pit National Park
What football will look like in the future
Sunday Sites - Like a game jam, but coding a website
RAID - A group zine about video games (good) and graphic design (bad)
Feral Hogs - Information on feral hogs