What are the best unknown sites on the Internet?

Firstly, I would like to point out that the below aren't "unknonwn" sites. They are few sites which aren't referred to about much in day to day life, maybe because they don't care about numbers but the content and purpose.

Also, by "unknown" I consider that anything not in the top 500 in Alexa ranking

• Serendipity

It is a website that tracks when 2 people in different cities,states,or countries have started listening to the same song at the same exact time on spotify. The creator wanted to show how people all over the world can be very different but still connected by music

 

• The Punctuation Guide -- A quick punctuation reference guide.
• Teleport Your Software Anywhere -- Use software without installing it.
• OpenStax College -- Free textbooks.
• MakeAGif - Funny Animated Gifs -- Convert videos and pictures into gifs.
• ZenPen ~ Minimal Distraction, Maximum Zen -- A distraction free writing tool.
• Hemingway Editor -- Make your writing bolder and clearer.
• Pineapple · Web Tutorials and Resources That Don't Suck -- A central hub of tutorials, tools, and assets for developers and designers.
• FilePizza - Your files, delivered. -- Transfer large files over the internet.
• http://www.kcna.co.jp/index-e.htm - North Korean official news feed.
• Nation State - Create your own country - NationStates is a nation simulation game. Create a nation, according to your political ideals, and care for its people. Or deliberately oppress them. It's up to you.
• E-mails from an Asshole
• http://head-fi.org for all things headphones.
• http://www.卐.com You can visit every day to remind yourself the uses of 卐
• www.heavens-above.com
• Put in your location and it will show you stars, satellites, planets, etc. that are in the sky.
• StoryCrafter - Find a story, create a character, write together!
• F******G HOMEPAGE
• Petit tube - Plays a random youtube video with very less views.
• http://iwastesomuchtime.com/
• The Black Vault -- Read declassified documents.
• Favorite and Forget -- Useful and educational links. Set it as you homepage and forget about it.
• duckduckgo.com -- An anonymous search engine.
• How Long to Read -- Find out how long it takes to read any book.
• Shuffle My Life -- Find something to do when you are bored.
• Build Cheat Sheets and Share Your Favourites! -- A database of cheatsheets for students.
• http://10minutemail.com/ - for when you need an email to confirm an account on some site you don't care about
• http://www.descriptionari.com/ - Quotes for creative writing
• http://librestock.com/- high quality stock photos.

•        www.boredbutton.com   Just give it a try when you have time :p

• https://www.duolingo.com/ (language-teaching website )
•  http://www.nicknotas.com/ (the Dating Specialist) 
•  http://www.nerdfitness.com/ (exercising and gym techniques)
•  http://www.informationisbeautifu...
•  http://www.geographyiq.com/
•  http://www.mindtools.com/
•  http://www.onelook.com/
•  https://www.cia.gov/library/publ...