Education & Learning
Courses, tutors, flashcards, and study systems.
Compute answers, not just search hits.
Graphing calculator that actually teaches.
Hundreds of one-job calculators.
The error-message graveyard that still works.
The honest docs for HTML, CSS, and JS.
Does this CSS work in Safari yet?
Step-by-step builds from real people.
API docs for many languages, fast and offline-ready.
Charts of how the world actually changed.
A planetarium tab: stars, planets, tonight’s sky.
Decode a JSON Web Token without guessing.
HTML, CSS, and JS pens you can fork in a tab.
Collaborative LaTeX in the browser.
Public-domain books as free ebooks.
Shelves, ratings, and what to read next.
LeetCode
CommunityInterview-style coding problems with a judge
Education & LearningInterview-style coding problems with a judge.
Quizlet
CommunityFlashcards and practice tests from your notes
Education & LearningFlashcards and practice tests from your notes.
Open preprints in math, physics, and CS.
Short talks from people who did the work.
On-demand video courses you buy once.
A catalog and borrowable scan of published books.
Fact-checks for rumors, hoaxes, and viral claims.
Coding challenges and interview practice.
Merriam-Webster
CommunityThe dictionary: definitions, audio, and usage
Education & LearningLook up a word, hear it, and see how it is used.
Encyclopaedia Britannica
CommunityA fact-checked encyclopedia you can cite
Education & LearningA fact-checked encyclopedia you can actually cite.
Thesaurus.com
Synonyms and antonyms when the word is almost right
Education & LearningSynonyms and antonyms when the word is almost right.
WorldCat
Find a book in a real library, not just a store
Education & LearningFind a book in a real library, not just a store.
Homework help, textbook rentals, and expert Q&A.
Search papers, citations, and author profiles in one box.
Graph, geometry, and algebra tools used in real classrooms.
Search papers with AI summaries and citation graphs, free.
MIT lecture notes, exams, and videos. No signup, no tuition.
Peer-reviewed college textbooks you can read or download for free.
W3Schools
CommunityTry-it tutorials for HTML, CSS, JavaScript, and more
Education & LearningPlain tutorials and a try-it editor for HTML, CSS, JS, and more.
JSTOR
CommunityAcademic journals, books, and primary sources
Education & LearningSearch academic journals, books, and primary sources — many free to read.
Missions, images, and explainers from the US space agency — no magazine rewrite.
Type, speak, or point the camera and get a translation in the tab.
A block-coding studio where kids and adults share games and animations.
Browser CAD for 3D models, circuits, and code blocks — then export an STL.
WordReference
CommunityBilingual dictionaries, conjugators, and usage forums
Education & LearningBilingual dictionaries plus conjugators and a huge usage forum.
Where an English word came from, and what it meant centuries ago.
A free wiki dictionary: senses, etymology, and translations for any language.
Free interactive science and math simulations from the University of Colorado.
wikiHow
Step-by-step how-tos with photos for everyday jobs
Education & LearningPhoto how-tos for everyday jobs — a blown fuse, a knot, a recipe, a form.
A free full-stack web-dev curriculum: projects, not just videos.
US public-radio news, shows, and podcasts from the same desk that goes on air.
Free K–12 computer-science and AI lessons a teacher can run tomorrow.
Coding katas ranked by kyu — train a language in bite-size challenges.
Dictionary.com
CommunityDefinitions, pronunciation, and how a word is used
Education & LearningLook up a word, hear it, and see how it is actually used.
DataCamp
CommunityData and AI courses with a browser scratchpad
Education & LearningLearn Python, SQL, and data work in the browser with short lessons and a scratchpad.
Definitions, learner examples, and UK/US audio for English words.
Symbolab
Step-by-step solutions for algebra through calculus
Education & LearningType a math problem and get the steps, not just the answer.
PBS
CommunityPublic-TV shows, documentaries, and NewsHour in a browser
Education & LearningPublic-TV documentaries, kids’ shows, and PBS NewsHour in the browser.
Duolingo
CommunityLanguage learning with daily streak fuel
Education & LearningBite-size language lessons with a streak that nags you back tomorrow.
roadmap.sh
CommunityCommunity roadmaps for developer career paths
Education & LearningVisual roadmaps for frontend, backend, and other developer paths — click a node, learn the next thing.
SparkNotes
Plot, characters, and quotes for the book due tomorrow
Education & LearningLiterature study guides: plot, characters, and quotes without rereading the whole book.
Pluralsight
Courses, skill tests, and labs for software and cloud teams
Education & LearningExpert-led courses, skill tests, and hands-on labs for software, cloud, and security teams.
Point the camera at a homework problem and get the steps, not just the number.
Search maps, recordings, newspapers, and exhibitions from the world’s largest library.
Homework help with an AI tutor and live experts — step-throughs for math, science, and more.
Audible
Audiobooks, podcasts, and originals you can take offline
Education & LearningAudiobooks, podcasts, and originals you can take offline — a library that is not a stack of CDs.
italki
1-on-1 language lessons with tutors worldwide
Education & LearningBook a 1-on-1 language lesson with a tutor worldwide — pay per session, no long subscription lock-in.
Nature
CommunityPapers and news from the Nature journals
Education & LearningRead papers and news from the Nature journals — the research desk scientists actually cite.
Preply
1-on-1 language lessons with tutors worldwide
Education & LearningBook a 1-on-1 language lesson with a tutor worldwide — pay per session, with trial lessons and a schedule that fits.
Class Central
A catalog of online courses from universities and platforms
Education & LearningSearch online courses from universities and platforms, then compare ratings in one catalog.
LitCharts
Literature guides with themes, quotes, and summaries
Education & LearningLiterature guides with themes, quotes, and summaries for the books assigned in class.
Wayground
Live classroom quizzes and homework — Quizizz under a new name
Education & LearningLive classroom quizzes and homework — the Quizizz desk, now on Wayground.
ClassDojo
Classroom points, photos, and messages for teachers and families
Education & LearningClassroom points, photos, and messages between teachers and families — the school app kids actually open.
Ancestry
Search historical records and grow a family tree
Education & LearningSearch census, birth, and immigration records, then grow a family tree from the hits.
Readwise
Resurface Kindle and article highlights so they stick
Education & LearningPull highlights from Kindle, books, and articles, then review them so the good lines come back.
Flexbox and Grid guides plus a CSS Almanac — the pages front-end people still open when a property will not behave.
Public-domain novels, carefully typeset as modern EPUB and Kindle files — free, no DRM, no broken quotes.
Look up a Spanish word, hear it, see a conjugation table, and run a short lesson — a dictionary that also teaches.
Look up a Japanese word, paste a sentence, or draw a kanji — a dictionary that also reads the line.
Raspberry Pi
Buy a tiny computer, flash an OS, and start a project or a classroom lab
Education & LearningBuy a tiny computer, flash an OS, and start a project or a classroom lab.
Arduino
Boards, Cloud, and docs to program a microcontroller and ship a project
Education & LearningBoards, Cloud, and docs to program a microcontroller and ship a project from a starter kit.
The StoryGraph
Track what you read and pick the next book by mood and theme
Education & LearningTrack what you read and pick the next book by mood and theme — a reading desk, not a social feed.
WaniKani
Learn kanji and vocab with mnemonics and spaced reviews, in a fixed order
Education & LearningKanji and vocab in a fixed order, with mnemonics and spaced reviews until the reading sticks.
Animated world charts and quizzes that catch the stats you still have wrong.
A JavaScript library for sketches and generative art — draw in the browser, share the sketch.
Sync Anki decks across devices and browse shared decks in the browser.
Trivia that donates 10 grains of rice to WFP for every correct answer.
Songsterr
Guitar, bass, and drum tabs that play back in rhythm
Education & LearningGuitar, bass, and drum tabs that play back in rhythm — loop the hard bar.
Forvo
Hear a word pronounced by native speakers, in any language
Education & LearningHear a word pronounced by native speakers, in hundreds of languages.
GeeksforGeeks
DSA tutorials, practice problems, and interview prep
Education & LearningDSA tutorials, practice problems, and interview prep — CS explainers with code you can work through.
Official Python downloads, docs, and the language homepage — the source, not a tutorial farm.
Official Rust downloads, The Book, and cargo — the language homepage, not a tutorial farm.
Official Node.js downloads, docs, and LTS — the runtime homepage, not a tutorial farm.
Official Go downloads, docs, and the language tour — the source homepage, not a tutorial farm.
Official docs, tutorials, and downloads for container orchestration — the project homepage, not a tutorial farm.
Official Angular docs, tutorials, and downloads — the framework homepage, not a tutorial farm.
Next.js
Official docs and the App Router for the React framework
Education & LearningOfficial Next.js docs, App Router, and create-next-app — the framework homepage, not a tutorial farm.
Moodle
Open-source LMS for courses, quizzes, and classrooms
Education & LearningOpen-source LMS: host courses, quizzes, and classrooms on your own server or a partner site.
Official Rust crate registry — search a package and cargo add it, not a tutorial farm.
Rosetta Stone
Immersive language lessons without a translation crutch
Education & LearningImmersive language lessons with speech practice and tutoring — a course, not a flashcard dump.
Visual boards and canvases for classes and teams — a wall, not a slide dump.
Notes that become spaced-repetition flashcards — a study desk, not a slide dump.
Brainscape
Spaced-repetition flashcards you find or make with AI
Education & LearningSpaced-repetition flashcards you find or make with AI — a deck, not a slide dump.
Classroom review games from a question set — a quiz, not a slide dump.
GitBook
Publish product docs with git-sync and an AI assistant for readers
Education & LearningPublish product docs with git-sync and an AI assistant for readers — a docs desk, not a forum dump.
Citation, résumé, and writing guides from Purdue’s Online Writing Lab — a desk, not a homework dump.
Free K-12 textbooks, simulations, and adaptive practice for math and science — a classroom, not a homework dump.
A public library of open educational resources teachers can search, remix, and assign — a classroom, not a homework dump.
Domestika
Online courses in design, illustration, photo, and crafts taught by working creatives
Education & LearningOnline courses in design, illustration, photo, and crafts taught by working creatives — a classroom, not a homework dump.
Cambly
1:1 English conversation with native-speaking tutors on demand, plus recordings and self-study
Education & Learning1:1 English conversation with native-speaking tutors on demand, plus recordings and self-study — a classroom, not a homework dump.
HelloTalk
Language exchange with native speakers over text, voice, and video, plus corrections in chat
Education & LearningLanguage exchange with native speakers over text, voice, and video, plus corrections in chat — a classroom, not a homework dump.
Nearpod
Interactive classroom lessons, live polls, and AI-created activities teachers run in class
Education & LearningInteractive classroom lessons, live polls, and AI-created activities teachers run in class — a classroom, not a homework dump.
Outschool
Live online classes for kids ages 3–18 across 140,000+ subjects taught by independent teachers
Education & LearningLive online classes for kids ages 3–18 across 140,000+ subjects taught by independent teachers — a classroom, not a homework dump.
Canvas LMS
The Canvas LMS teachers and schools use for courses, grades, and assignments
Education & LearningThe Canvas LMS teachers and schools use for courses, grades, and assignments — a classroom, not a homework dump.
Google Classroom
Free class spaces for assignments, grades, and Google Drive work teachers run at school
Education & LearningFree class spaces for assignments, grades, and Google Drive work teachers run at school — a classroom, not a homework dump.
Rosetta Stone
Learn a language with TruAccent speech and structured lessons on web and apps
Education & LearningLearn a language with TruAccent speech and structured lessons on web and apps — a classroom, not a homework dump.
IXL
K–12 practice in math, English, and science with skill plans teachers assign
Education & LearningK–12 practice in math, English, and science with skill plans teachers assign — a classroom, not a homework dump.
Blackboard
An LMS for courses, grades, and assignments used by schools and universities
Education & LearningAn LMS for courses, grades, and assignments used by schools and universities — a classroom, not a homework dump.
Seesaw
An elementary learning platform where students post work and families see the classroom in real time
Education & LearningAn elementary learning platform where students post work and families see the classroom in real time — a classroom, not a homework dump.
BrainPOP
Animated K–8 videos and quizzes on science, social studies, math, and more that teachers play in class
Education & LearningAnimated K–8 videos and quizzes on science, social studies, math, and more that teachers play in class — a classroom, not a homework dump.
Edpuzzle
Teachers crop a video, drop questions on the timeline, and see who actually watched
Education & LearningTeachers crop a video, drop questions on the timeline, and see who actually watched — a classroom, not a homework dump.
Leveled articles and quizzes for ELA, social studies, and STEM that teachers assign at each student’s reading level — a classroom, not a homework dump.
CommonLit
A free text library and full ELA curriculum with quizzes and benchmarks teachers assign by grade
Education & LearningA free text library and full ELA curriculum with quizzes and benchmarks teachers assign by grade — a classroom, not a homework dump.
Prodigy
A curriculum-aligned math and English game teachers assign for free, with optional parent memberships
Education & LearningA curriculum-aligned math and English game teachers assign for free, with optional parent memberships — a classroom, not a homework dump.
Epic
A kids’ library of 40,000+ books, audiobooks, and videos; free for teachers, family plans extra
Education & LearningA kids’ library of 40,000+ books, audiobooks, and videos; free for teachers, family plans extra — a classroom, not a homework dump.
NEJM
Peer-reviewed research, reviews, and cases physicians actually cite, from the New England Journal of Medicine
Education & LearningThe New England Journal of Medicine: peer-reviewed research, reviews, and cases physicians actually cite — a classroom, not a homework dump.
Starfall
Untimed reading, math, and music games for Pre-K through grade 5
Education & LearningUntimed reading, math, and music games for Pre-K through grade 5 — a classroom, not a homework dump.
PBS KIDS
Free games, videos, and shows for kids from PBS, with characters from the TV lineup
Education & LearningFree games, videos, and shows for kids from PBS, with characters from the TV lineup — a classroom, not a homework dump.
Project Euler
A series of computational math problems you solve by writing a program
Education & LearningA series of computational math problems you solve by writing a program — a classroom, not a homework dump.
Processing
A free language and IDE for sketching with code, used to teach visual programming
Education & LearningA free language and IDE for sketching with code, used to teach visual programming — a classroom, not a homework dump.
Advent of Code
An annual calendar of programming puzzles, with past years still open to solve
Education & LearningAn annual calendar of programming puzzles, with past years still open to solve — a classroom, not a homework dump.
Exercism
Practice 80+ programming languages with exercises and optional mentoring
Education & LearningPractice 80+ programming languages with exercises and optional mentoring — a classroom, not a homework dump.
Codeforces
Competitive programming contests, a huge problemset, and a rating you can climb
Education & LearningCompetitive programming contests, a huge problemset, and a rating you can climb — a classroom, not a homework dump.
AtCoder
Weekly programming contests from beginner to expert, with a public rating you can climb
Education & LearningWeekly programming contests from beginner to expert, with a public rating you can climb — a classroom, not a homework dump.
CS50
Harvard’s intro computer science course: lectures, problem sets, and a free certificate track
Education & LearningHarvard’s intro computer science course: lectures, problem sets, and a free certificate track — a classroom, not a homework dump.
Neovim
A Vim-compatible editor with Lua config, LSP, and treesitter, built for plugins
Education & LearningA Vim-compatible editor with Lua config, LSP, and treesitter, built for plugins — a classroom, not a homework dump.
Helix
A modal editor with multiple selections, tree-sitter, and built-in LSP, no plugin maze required
Education & LearningA modal editor with multiple selections, tree-sitter, and built-in LSP, no plugin maze required — a classroom, not a homework dump.
Seterra
Hundreds of map quizzes for countries, capitals, flags, and rivers, built for classrooms and self-study
Education & LearningHundreds of map quizzes for countries, capitals, flags, and rivers, built for classrooms and self-study — a classroom, not a homework dump.
Thinkific
Build, sell, and host online courses with a drag-and-drop builder and checkout
Education & LearningBuild, sell, and host online courses with a drag-and-drop builder and checkout — a classroom, not a homework dump.
FutureLearn
Take short online courses from universities and companies, at your own pace
Education & LearningTake short online courses from universities and companies, at your own pace — a classroom, not a homework dump.
SparkFun
Buy sensors, boards, and kits, plus tutorials for electronics and Arduino-class builds
Education & LearningBuy sensors, boards, and kits, plus tutorials for electronics and Arduino-class builds — a classroom, not a homework dump.
LingQ
Learn a language by reading and listening to real content, then tap unknown words as you go
Education & LearningLearn a language by reading and listening to real content, then tap unknown words as you go — a classroom, not a homework dump.
GNU Emacs
A free extensible text editor with Lisp, packages, and a built-in everything-buffer
Education & LearningA free extensible text editor with Lisp, packages, and a built-in everything-buffer — a classroom, not a homework dump.
IntelliJ IDEA
A Java-first IDE with refactoring, inspections, and a free Community edition used in classrooms and shops
Education & LearningA Java-first IDE with refactoring, inspections, and a free Community edition used in classrooms and shops — a classroom, not a homework dump.
PyCharm
A Python IDE with a debugger, Jupyter, and a free Community edition used in class and at work
Education & LearningA Python IDE with a debugger, Jupyter, and a free Community edition used in class and at work — a classroom, not a homework dump.
WebStorm
A JavaScript and TypeScript IDE with refactoring, a debugger, and built-in tools for web work
Education & LearningA JavaScript and TypeScript IDE with refactoring, a debugger, and built-in tools for web work — a classroom, not a homework dump.
TypeScript
The official TypeScript handbook, playground, and download pages for typed JavaScript
Education & LearningThe official TypeScript handbook, playground, and download pages for typed JavaScript — a classroom, not a homework dump.
The Modern JavaScript Tutorial: from basics to advanced topics, with examples you can run in the browser — a classroom, not a homework dump.
PhpStorm
A PHP IDE with refactoring, a debugger, and tools for Laravel and Symfony work
Education & LearningA PHP IDE with refactoring, a debugger, and tools for Laravel and Symfony work — a classroom, not a homework dump.
egghead.io
Short expert video lessons on JavaScript, React, TypeScript, and Node, from the official egghead.io classroom
Education & LearningShort expert video lessons on JavaScript, React, TypeScript, and Node, from the official egghead.io classroom — a classroom, not a homework dump.
Frontend Masters
Expert video courses on JavaScript, React, TypeScript, and full-stack work from the Frontend Masters classroom
Education & LearningExpert video courses on JavaScript, React, TypeScript, and full-stack work from the Frontend Masters classroom — a classroom, not a homework dump.
Laravel
The official Laravel PHP framework homepage: docs, starter kits, and Cloud for shipping PHP apps
Education & LearningThe official Laravel PHP framework homepage: docs, starter kits, and Cloud for shipping PHP apps — a classroom, not a homework dump.
Django
The official Django Python web framework homepage: docs, tutorials, and downloads
Education & LearningThe official Django Python web framework homepage: docs, tutorials, and downloads — a classroom, not a homework dump.
Astro
The official Astro web-framework homepage: docs, islands architecture, and a content-first build
Education & LearningThe official Astro web-framework homepage: docs, islands architecture, and a content-first build — a classroom, not a homework dump.
Ruby on Rails
The official Ruby on Rails homepage: docs, conventions, and downloads for building web apps
Education & LearningThe official Ruby on Rails homepage: docs, conventions, and downloads for building web apps — a classroom, not a homework dump.
Nuxt
The official Nuxt Vue framework homepage: docs, server routes, and a full-stack build
Education & LearningThe official Nuxt Vue framework homepage: docs, server routes, and a full-stack build — a classroom, not a homework dump.
Hugo
The official Hugo static-site homepage: docs, lightning-fast builds, and a single binary
Education & LearningThe official Hugo static-site homepage: docs, lightning-fast builds, and a single binary — a classroom, not a homework dump.
NestJS
The official NestJS Node framework homepage: docs, modules, and a progressive TypeScript build
Education & LearningThe official NestJS Node framework homepage: docs, modules, and a progressive TypeScript build — a classroom, not a homework dump.
A free full-stack web-dev curriculum with projects and a community, from The Odin Project homepage — a classroom, not a homework dump.
FastAPI
The official FastAPI Python homepage: docs, type hints, and a high-performance API framework
Education & LearningThe official FastAPI Python homepage: docs, type hints, and a high-performance API framework — a classroom, not a homework dump.
Kotlin
The official Kotlin language homepage: docs, examples, and a modern language for JVM, Android, and beyond
Education & LearningThe official Kotlin language homepage: docs, examples, and a modern language for JVM, Android, and beyond — a classroom, not a homework dump.
Project Jupyter
The official Project Jupyter homepage: notebooks, docs, and the classic lab for code and data
Education & LearningThe official Project Jupyter homepage: notebooks, docs, and the classic lab for code and data — a classroom, not a homework dump.
Vue.js
The official Vue.js homepage: docs, the progressive framework, and a gentle path from a script tag to an app
Education & LearningThe official Vue.js homepage: docs, the progressive framework, and a gentle path from a script tag to an app — a classroom, not a homework dump.
React
The official React homepage: docs, hooks, and the library for building user interfaces
Education & LearningThe official React homepage: docs, hooks, and the library for building user interfaces — a classroom, not a homework dump.
PostgreSQL
The official PostgreSQL homepage: docs, downloads, and the advanced open-source database
Education & LearningThe official PostgreSQL homepage: docs, downloads, and the advanced open-source database — a classroom, not a homework dump.
PHP
The official PHP homepage: docs, downloads, and the language that still runs a lot of the web
Education & LearningThe official PHP homepage: docs, downloads, and the language that still runs a lot of the web — a classroom, not a homework dump.
Vite
The official Vite homepage: docs and a next-generation frontend toolchain that starts a dev server in milliseconds
Education & LearningThe official Vite homepage: docs and a next-generation frontend toolchain that starts a dev server in milliseconds — a classroom, not a homework dump.
Dart
The official Dart language homepage: docs, the SDK, and a typed language for apps and the web
Education & LearningThe official Dart language homepage: docs, the SDK, and a typed language for apps and the web — a classroom, not a homework dump.
SQLite
The official SQLite homepage: docs, downloads, and the embedded database that lives in a file
Education & LearningThe official SQLite homepage: docs, downloads, and the embedded database that lives in a file — a classroom, not a homework dump.
Ruby
The official Ruby language homepage: docs, downloads, and a language built for getting things done
Education & LearningThe official Ruby language homepage: docs, downloads, and a language built for getting things done — a classroom, not a homework dump.
Elixir
The official Elixir language homepage: docs, the BEAM, and a functional language for concurrent apps
Education & LearningThe official Elixir language homepage: docs, the BEAM, and a functional language for concurrent apps — a classroom, not a homework dump.
Julia
The official Julia language homepage: docs, a high-performance language for science and data
Education & LearningThe official Julia language homepage: docs, a high-performance language for science and data — a classroom, not a homework dump.
nginx
The official nginx homepage: docs and a high-performance web server and reverse proxy
Education & LearningThe official nginx homepage: docs and a high-performance web server and reverse proxy — a classroom, not a homework dump.
Flask
The official Flask Python docs: a lightweight web framework for APIs and sites
Education & LearningThe official Flask Python docs: a lightweight web framework for APIs and sites — a classroom, not a homework dump.
Zig
The official Zig language homepage: docs, a systems language with manual memory and a fast toolchain
Education & LearningThe official Zig language homepage: docs, a systems language with manual memory and a fast toolchain — a classroom, not a homework dump.
MySQL
The official MySQL homepage: docs, downloads, and the relational database that still runs a lot of the web
Education & LearningThe official MySQL homepage: docs, downloads, and the relational database that still runs a lot of the web — a classroom, not a homework dump.
Tailwind CSS
The official Tailwind CSS homepage: docs and a utility-first CSS framework you can build in without leaving HTML
Education & LearningThe official Tailwind CSS homepage: docs and a utility-first CSS framework you can build in without leaving HTML — a classroom, not a homework dump.
Haskell
The official Haskell language homepage: docs, a purely functional language, and the compiler toolchain
Education & LearningThe official Haskell language homepage: docs, a purely functional language, and the compiler toolchain — a classroom, not a homework dump.
Swift
The official Swift language homepage: docs, the compiler, and a language for apps and servers
Education & LearningThe official Swift language homepage: docs, the compiler, and a language for apps and servers — a classroom, not a homework dump.
R
The official R Project homepage: docs, downloads, and the language for statistics and data
Education & LearningThe official R Project homepage: docs, downloads, and the language for statistics and data — a classroom, not a homework dump.
Bootstrap
The official Bootstrap homepage: docs and a CSS toolkit for responsive layouts and components
Education & LearningThe official Bootstrap homepage: docs and a CSS toolkit for responsive layouts and components — a classroom, not a homework dump.
Lua
The official Lua language homepage: docs, a lightweight language for embedding and scripting
Education & LearningThe official Lua language homepage: docs, a lightweight language for embedding and scripting — a classroom, not a homework dump.