This To That tells you what type of adhesive to use to glue different materials together. It's handy for Halloween when suddenly you need to figure out how to attach vinyl to styrofoam or something (hot glue)

https://favicon.io/favicon-converter/ - Convert an image to a favicon file in many formats.

https://ninite.com/ - Easiest way to set up a new Windows PC with the latest common applications without toolbars, prompts, or anything like that. Not necessarily obscure but I like to peddle it.

https://www.printablepaper.net/ - Need a check register? Graph paper? Lined paper? College ruled or wide ruled? Dot paper? Calendars? If it's on paper, chances are you can find it and print it here.

https://scp-wiki.wikidot.com/ - Need a good bedtime story? This site is best read right before falling asleep.

Want to know something about published science fiction or fantasy? Forget Goodreads or Wikipedia bibliographies, the ISFDB has ridiculously comprehensive details about every book, author or magazine I've looked up.

https://www.isfdb.org/

Google will give you ISFDB results if you search for an author or title plus "isfdb" but it's not nearly as high in the rankings as it should be.

https://port87.com

An email service that uses addresses like yourname-appname@port87.com to organize all your email into a folder for every app/service.

You can also make these addresses screen senders before their email goes through, for something like yourname-friends@port87.com.

You can mark them as public and they’ll be included in a list if someone emails the bare address (yourname@port87.com), so you can share your bare address all over the internet without getting spam.

(Full disclosure: I created and operate this service.)

This site will show you how to tackle any stain.

to keep up to date on zoomer slang: Bruh.News

Free Media Heck Yeah. The largest collection of Free stuff on the Internet

https://fmhy.net

If you need a bed or bedding, https://www.sleeplikethedead.com/ collects and distills online reviews from everywhere about it.

If you need earbuds, http://www.scarbir.com/ does similar.

Idk how obscure it is but Paul’s Online Math Notes https://tutorial.math.lamar.edu/ are the best math guide I’ve ever had. It got me through an engineering degree

https://it-tools.tech/

Bonus points is you can host yourself with docker. It has a bunch of handy tools for computer related projects.

https://www.whatfontis.com/

Figures out what the font is from an uploaded image. I've used it multiple times.

privacyguides.org has a ton of awesome tips on how to navigate technology these days without becoming a walking data point for everything you have contact with.

seirdy.one has this great index of google alternatives that can be used.

Anna's Archive and z-library are the best way I've found to pirate books

http://remove.bg is a website that makes removing backgrounds from photos or artwork a lot easier! I think it uses A.I or something, it's been super helpful for me a couple times.

The first and foremost thing that comes to mind is the wayback machine. It lets you archive and immortalize any moment in a website's history.

Though I may be cheating a little here because it's actually a toolbar, another obscure, highly useful "website" is the Hypothesis toolbar. It adds a comment section to any webpage merely by existing.

https://live.sympy.org/

It's basically an interactive Python session using a Python interpreter compiled to WebAssembly and which then runs locally on your device via your browser without having to install anything on your end.

It's very cool to check some calculation out very quickly on your phone or tablet.

Or if you want a full local Jupyterlab experience using the same WebAssembly tech: https://jupyterlite.readthedocs.io/en/stable/_static/lab/index.html (based on the JupyterLite project: https://github.com/jupyterlite/jupyterlite)

https://wiby.me/

Searches for web pages without JavaScript. The Surprise me! option is fun for finding random ass old sites too

edit: https://mapfight.xyz/

Compare the size of any two landmasses.

Taking a chemistry class? ptable.com is the best Periodic Table site by far, packed with info and ways to visualize the relationships between elements.

Interested in what class doesn't teach you about the elements? Theodore Gray's Wooden Periodic Table Table website has a ton of very high resolution shots of the best samples you'll find, along with detailed backstory on where each one came from or how it was used.

If you have to write Objective-C for some unfortunate reason - http://fuckingblocksyntax.com/

If you have to write Objective-C for some unfortunate reason and your IT infrastructure doesn't like fun - http://goshdarnblocksyntax.com/

No idea if this is obscure or not, but for creating diagrams I've found draw.io a very useful free website/tool (there's an offline version).
The ability to hide the entire model inside the png is really neat. You can upload the png in a wiki and later on just import it to alter it again.

When I watch movies or TV shows, I constantly wonder how old an actor or actress is during the filming of it:

MovieAges.com

3d models of the human body, I use this a lot to troubleshoot which muscle I'm having tension/tightness in:

Human.biodigital.com

You might be able to find this website on Google, but if you are in the US, this can help you get the freshest produce. I use it all the time. https://snaped.fns.usda.gov/resources/nutrition-education-materials/seasonal-produce-guide

Radio Garden - Listen to hundreds of radios around the globe (with a pretty interface to find your favorite radio station). Having lived in several countries, I have a list of radio stations I grew to like, and now I can have easy access to all of them.

Noclip.website isn't all that useful, but insanely cool. Allows you to fly around maps of n64, GameCube and Wii games in 3d, rendered in your browser

With 20k GitHub stars not really obscure I suppose, but maybe someone doesn't know it:

https://gchq.github.io/CyberChef/

Works offline and you can chain recipes.

I've been using https://squoosh.app/ a lot recently. Found it in a similar thread

EDIT: It is an image compression site where the images never leave your device. Or so the privacy policy says anyway. It took some tweaking, but i've had some images with an 80%+ size reducrion with almost no perceivable quality loss.

Microwave Watt?? Converts cooking instructions to whatever your actual microwave is (mine’s a shitty 700w beast so I have to add about 50% cooking time to most things). http://www.microwavewatt.com/

https://thistothat.com/

How to glue things together

brutalist.report The day's headlines delivered to you without bullshit.

If you often post links to music then Songwhip is invaluable. Give it a song and it generates a page with links to many common streaming services.

Here's an example.

It's not obscure, but i love APKpure to download beta versions of whatsapp

Check out c/internetisbeautiful