Trace how English, Hindi, and 400+ other languages all came from one ancestor.

A list of every end-of-the-world prediction that was wrong.

Hundreds of thousands of Wikipedia military history articles pinned to a 3D globe.

Lets you experience a website the way someone with a disability would.

8,000 real letters written by ancient Romans, all translated and searchable.

A non-profit library of millions of free books, movies, software, music, and websites — including the Wayback Machine. The digital Library of Alexandria.

Leo Babauta's archive of essays on minimalism — applied to work, possessions, design, and digital life. Short, focused reads on doing more with less.

Browse and download high-resolution artworks from the Rijksmuseum's collection — Vermeer, Rembrandt, and 700,000+ other works. Create your own collections.

Explore 700,000+ archaeological artifacts excavated during Amsterdam's North-South metro line construction. Each object tells a story spanning 800 years of city life.

Nicky Case's brilliant interactive guide to game theory. Play through the Prisoner's Dilemma and discover why trust and cooperation evolve — or collapse.

Interactive simulations for physics, chemistry, and other sciences.

Open Library is a digital library platform that offers free access to millions of books in various formats, including eBooks, audiobooks, and print-disabled versions. Created by the Internet Archive, it aims to provide "one web page for every book ever published," allowing users to borrow, read, and explore a vast collection of titles spanning multiple genres and languages. The platform also features community-driven initiatives, enabling users to contribute to book entries, create reading...

While the website doesn't look that appealing, Distributed Proofreaders is a large project devised to help bring public domain books onto the internet in the form of ebooks. But before the books can be uploaded, they need to be examined and proofread. That's where you come in! Anyone can volunteer and you'll be presented with a scanned page from a book, along with a computer-generated version of the text. All you need to do is proofread the computer's text to make sure it is accurate and...

Site challenging misconceptions with engaging facts and stories.

Justin Guitar is a popular online guitar learning platform created by Justin Sandercoe, a professional guitarist and educator. The site offers free guitar lessons for beginners to advanced players, covering a wide range of styles like rock, blues, jazz, and more. It features structured courses, play-along exercises, song tutorials, and music theory lessons. Justin's teaching style is laid-back, clear, and easy to follow, making it a go-to resource for many aspiring guitarists. The site also...

The Noba Project is an open-access platform that provides free, high-quality psychology textbooks and educational materials. It aims to make psychology education accessible to students and educators worldwide by offering textbooks written by leading experts in the field. Users can access comprehensive textbooks, individual chapters, or custom-built learning modules on various psychology topics. The platform is widely used by educators to build or supplement course materials, and students can...

Popular trivia platform with quizzes on geography and general knowledge.

Interactive explanations and simulations that teach complex ideas.

OpenStax is a website that offers a list of educational textbooks completely for free.

Global time, calendar, and date calculators for everyday use.

AI-assisted language learning through reading and listening immersion.

Free online courses that prepare you for CLEP exams, which earn real college credits. Includes free vouchers for the exams. One user saved over $3,000 and earned 28 credits.

Gamified language learning using fill-in-the-blank practice.

Songsterr is a collection of user-created tablature for guitarists to freely search and play for themselves. All the tab sheets have a playable guide that you can listen to which makes it easier to learn the songs. Songsterr can become a guitarist's secret weapon for learning hundreds of songs quickly. Songsterr is available as an IOS and Android app which both support offline tabs so you can take your tabs anywhere to perform.

Spaced repetition flashcard system for efficient memorization.

Math solver with step-by-step explanations for complex problems.

LibriVox is a volunteer-driven platform that provides free audiobooks of public domain works. Volunteers from around the world narrate and record books, making classic literature, poetry, and non-fiction accessible in audio format. The site offers a wide range of genres and languages, allowing users to download or stream these recordings for free. Since all the works are in the public domain, the books are primarily older titles, often literary classics. It's a great resource for anyone...

A comprehensive online dictionary of word origins. Look up any English word and trace its history back through centuries of linguistic evolution.

Free educational games for kids covering math and reading.

University courses and certificates from institutions around the world.

A curated collection of free educational and cultural resources: online courses, e-books, lectures, films, audiobooks, and language lessons from top universities and institutions.

Coding lessons and games for kids to learn programming.

HanbokStudy.com is an innovative online platform designed to enhance language learning through detailed sentence analysis. Originally developed for Korean, it now supports multiple languages, offering comprehensive grammar breakdowns, cultural insights, and pronunciation guides. Utilizing AI technology, HanbokStudy.com links related words and patterns, facilitating a deeper understanding of sentence structures. Users appreciate its instant analysis features and have suggested additional...

Online community offering creative courses in art, design, and crafts.

Educational site with games, videos, and facts for children.

Adaptive flashcard learning platform based on cognitive science.

A retired math teacher has built full-blown math lessons for every grade, from 1st to 12th, and includes AP math lessons — all for free, relying only on donations.

Meta-search engine for finding books across online stores.

Book and article summaries for professionals.

Nonprofit providing coding lessons and resources for students.

Math games, lessons, and puzzles for children.

Convert units across categories like length, weight, temperature, and more.

AI-powered language learning with video clips from native speakers.

Language learning platform with email-based lessons and vocabulary.

Gamified math learning platform for children.

Interactive science experiments and demonstrations for students.

Detailed book summaries and analysis platform.

Free online university lectures and courses from top schools.

ManualsLib is a website that provides millions of PDF manuals for a large collection of devices, from game consoles to cars, you can find something in here to help you understand your piece of technology better.

Text-to-speech tool for converting written text into spoken audio.

Study guides and summaries for literature and more.

Free, ad-free streaming of critically acclaimed films, documentaries, and indie movies — all you need is a library card. Better arthouse and foreign film selection than most paid services.

Compare how different media outlets cover the same story, see the political bias of each source, and discover news that isn't getting covered at all. Like AP on steroids.

Search and browse the complete works of over 70,000 bestselling fiction authors, with all their books and series listed in order. A reader's essential reference.

A charming, beginner-friendly site that teaches the basics of HTML and web coding. Great for kids or absolute beginners getting their first taste of web development.

Marshall's site is a web resource that allows you to "Master Japanese from scratch for free" with over 1000 Japanese lessons and 4000 Japanese quizzes, this could be the right direction for any wannabe Japanese speaker. You don't need to create an account to use this site, but there are a few advantages to creating an account like leaderboards, badges, interacting in forums, and more. The website was created by a person that goes by the name Marshall. They are very committed to this project,...