realtimecolors.com

Live testing color palettes and fonts for web design. Made by a designer who's really great, she runs a YouTube channel and made the site for free use by anyone.

If you like to play chess, check out www.lichess.org

It's free and open source, and it's very easy to find a game there, no matter what level you play.

It doesn't display annoying ads.

There is this really cool place called Lemmy, I'm sure many people here have heard of it but not anyone I ask in other places. It's like Reddit, it's a forum-esque place where people can exchange their thoughts. The people are a little biased on the extreme Marxist side of things, but overall it's pretty nice.

https://neal.fun

A variety of neat activities and educational pages.

https://html5zombo.com

Ian's Shoelace Site:
Different ways to lace your shoes.

The Phrontistery:
Glossaries of, e.g., obscure words, lost words, etc.

Gayhomophobe.com it counts the time since the last openly homophobic figure was caught in a gay sex scandal

https://hackertyper.com/

I've actually seen this used in movies and TV shows.

http://wiby.me/ is a cool site. It's a search engine that only has web 1.0 and web 1.0-styled websites.

www.5minute.games

It's a list of all the good word games, minigames and puzzles on the internet, and you can customize it to shortlist your favorites and even add new links. I go there every day to link to all my favorites.

...oh, full disclosure: I built it. Though hopefully nobody minds, since there's no ads or monetization whatsoever.

Foldnfly.com - shows dozens of ways to fold paper airplanes.

www.thetruesize.com - Find the true size of one country compared to another.

There is a - pretty dead - community, but maybe some of you could revive it: !coolwebsites@lemmy.ca

https://everynoise.com

Every music genre you can think of, and then some. I finally found out what the stuff I like is called.

I might’ve came across it from a post here on Lemmy, but this website is great for music discovery. It lets you listen to music by decade and country via a neat map UI.

https://radiooooo.com/

userinyerface.com

Something that far too many managers and developers need to see, so they can better understand why their decisions and work completely sucks.

Library of Babel

I needed Unicode symbols for a story I'm working on. (I want to use them as "magic runes" so I could type them into a document, but without using the standard "runes" that are typically used.)

Shape Catcher let me draw what I was looking for and then get a list of Unicode characters that matched that drawing. It's not exact so if there's no perfect Unicode match, it will give you ones that are close. This actually turned out to my benefit as I found shapes I hadn't considered but which worked nicely for my uses.

https://chickenonaraft.com/

As the name suggests, you hang out with a chicken on a raft

https://www.pokealexintheeye.com/

It's not great by today's standards, but in the late 90's my friends and I found this to be the peak of internet entertainment.

Photoshop in your browser for free: https://www.photopea.com/

mynoise.net .

I use it for background when I need to concentrate.

lemmy.world

http://endless.horse

The only sad thing is it doesn't support https :(

https://loopsofzen.uk

If it doesn't work, you don't have working ipv6.

https://zombo.com/

https://www.albinoblacksheep.com/

I still break out into Badger, badger, badger occasionally....

https://ciechanow.ski/

website that simulates fluids

https://ytmnd.com

https://noclip.website/

Basically a model viewer/freecam for stages from various video games. Really neat to see the tricks various devs pull to conserve detail.

https://www.nonograms.org/

Very entertaining.

http://thesneeze.com/

I really liked this blog like 10+ years ago.

He's got a lot of funny stuff on there where he eats unusual food, talks about a fungus growing on his trees, and other things he has observed. He even has an interview with Adam Savage!

He is also the none pizza left beef pizza guy.

http://acid1.acidtests.org/

https://www.webstandards.org/files/acid2/test.html

http://acid3.acidtests.org/

These websites were made to test out if your installed web browser is compliant with the worldwide web standards. It’s pretty neat stuff

https://earth.nullschool.net/ realtime global wind, pressure, temp, etc.