Study

Free world-class education platform with structured lessons in math, science, computing, economics and more. 100% free for learners with no ads on lessons; supported by donations. Perfect for K-12 students, exam prep and lifelong learners.

Official MIT's publication of nearly all MIT course materials online — video lectures, problem sets, exams and reading lists for free, across engineering, science, humanities and more. 100% free to access; no certificate or degree is awarded. Perfect for self-learners who want real MIT content.

Official documentation for HTML, CSS, JavaScript and Web APIs, maintained by Mozilla with community contributions. Free, ad-light, and updated alongside browser releases. Best for web developers at any level who want accurate reference material.

The free encyclopedia that anyone can edit, with 60+ million articles in 300+ languages and no paywall. Free and ad-free on main articles, run by the Wikimedia nonprofit. Suited for students, researchers and anyone who needs a quick reference.

Official open-access archive for scholarly articles in physics, math, CS, biology, finance and more, run by Cornell University; the de facto preprint server for cutting-edge research. 100% free, ad-free. Best for academics, researchers and curious learners tracking the latest in science and CS.

Official YouTube-backed educational series of fast-paced, animated courses on world history, biology, chemistry, economics, philosophy and more, hosted by the Green brothers. 100% free to watch on YouTube; some companion workbooks are paid. Perfect for high-school and college learners who want quick overviews.

Official open-source, cross-platform flashcard app using spaced repetition to help you memorise anything, with shared decks and add-on support. 100% free on Windows/Linux/macOS (open source); AnkiMobile on iOS is paid. Ideal for students, med-school learners and language learners who want long-term retention.

Project Gutenberg's official free library of over 70,000 public-domain ebooks, available in EPUB, Kindle and plain text without DRM. 100% free, no ads, no signup, supported by donations. Perfect for readers, students and teachers who want classic literature and reference.

Official free online graphing calculator and activity platform for math classrooms, with a clean interface and sharing. 100% free for students and teachers; no paid tier for the core tools. Ideal for school math, SAT prep and visualizing functions.

University of Colorado's official free collection of interactive science and math simulations, translated into many languages. 100% free for teachers and students, supported by grants. Best for school physics, chemistry and biology learners who learn by doing.

Official Google-operated free academic search engine that indexes peer-reviewed papers, theses, books, abstracts and court opinions across publishers and repositories worldwide, with citation tracking and author profiles. 100% free. Best for students, researchers and academics who need a one-stop scholarly search.

Official TED's educational arm offering animated lessons, video series and a "You Choose" lesson builder on topics from science to literature. 100% free to watch and create lessons. Best for curious learners, students and teachers who want short, high-quality explainers.

Official Indian government initiative offering free video courses from IITs and IISc in engineering, science and humanities. 100% free to watch; optional paid proctored exams give certificates. Ideal for Indian engineering and science students preparing for campus placements.

Official free dynamic math software for geometry, algebra, calculus and statistics with interactive graphs and classroom resources. 100% free to use in browser and apps; GeoGebra Math Resources are also free. Great for school and college math students and teachers.

Official interactive learning platform focused on math, science and computer science through guided problem solving. Free daily puzzles and a free trial; full access requires a paid subscription. Best for curious learners who prefer visual, hands-on problem solving.

Nonprofit digital library archiving millions of free books, movies, software, music and historic web pages. Free to access and supported by donations; some items use controlled digital lending. Suited for researchers, students and history enthusiasts.

Official Rice University OpenStax free open textbook publisher for college and AP subjects, used by millions of students worldwide. 100% free; low-cost print. Best for college students and self-learners.

Official computational knowledge engine that answers factual queries by computing answers from curated data across math, science, engineering and everyday life. Free tier with limited compute time; Pro is a paid plan with more compute and step-by-step solutions. Best for students and professionals who need reliable, computed answers.

Official online encyclopedia from Encyclopædia Britannica, Inc., with editor-reviewed articles, biographies, primary sources and educational resources. Free to read online; Britannica Plus and Merriam-Webster access are paid subscriptions. Best for students, researchers and curious readers who want trusted, curated content.

Official OEIS On-Line Encyclopedia of Integer Sequences free database of millions of integer sequences with references, formulas and code, used by mathematicians worldwide. 100% free. Best for mathematicians and CS students.

Official Google Classroom free LMS that lets teachers create classes, distribute assignments, grade and give feedback, all inside Google Workspace. 100% free for schools. Best for schools already using Google.

Official Memrise language learning app with native-speaker videos, spaced-repetition flashcards and AI tutor mode for many languages. Free tier; paid Pro. Best for casual language learners.

Official platform with university and industry courses, specializations and degrees from top schools like Yale, Stanford and Google. Free to audit most courses; certificates and graded items are paid. Best for students and professionals who want recognized credentials.

Official MOOC platform founded by Harvard and MIT with university courses, MicroMasters programs and bootcamps across many fields. Free to audit; verified certificates and programs are paid. Suited for serious learners and professionals building a formal record.

Bite-sized language learning app with gamified daily lessons in 40+ languages and short podcast-style stories. Free core lessons include ads; Super removes ads and adds extras. Suited for beginners and casual learners who want a daily habit.

Official Indian Institute of Technology Kharagpur-led digital library aggregating 100M+ academic resources — books, articles, videos, theses, simulations — from 300+ Indian and international sources. 100% free, ad-free, supports multiple Indian languages. Best for Indian students, researchers and lifelong learners.

Official flashcard and study tool with user-generated decks in nearly every subject, plus games and practice tests. Free with ads; Quizlet Plus removes ads and unlocks advanced study modes. Great for school and college students who want spaced repetition on any topic.

Official Indian government MOOC platform hosting free courses from school to post-graduate level across many disciplines. 100% free to enroll and learn; optional paid proctored exams give certificates. Best for Indian students and lifelong learners wanting a national credential.

Official Mathway math problem solver with step-by-step help for basic math, algebra, trigonometry, calculus, statistics, chemistry and graphing. Free; paid Chegg. Best for quick math help on any topic.

Official Symbolab AI math solver with step-by-step solutions for algebra, calculus, trigonometry, chemistry and more, plus a practice platform. Free; paid Pro. Best for high school and college math homework.

Official Babbel paid language learning platform with conversation-first lessons, speech recognition and review sessions crafted by linguists. Paid subscription. Best for adults who want structured language practice.

Official Busuu language learning platform with self-paced lessons, community feedback from native speakers and AI-powered review, plus McGraw-Hill certificates. Free; paid Premium. Best for social language learners.

Official Nearpod interactive lesson platform that lets teachers add polls, quizzes, VR field trips and real-time collaboration to any slide deck. Free tier; paid school licenses. Best for in-class tech-rich teachers.

Official Government of India national digital infrastructure for school education, with NCERT textbooks, e-content, teacher resources and courses in 30+ Indian languages, used by millions of Indian students. 100% free, ad-free. Best for Indian K-12 students, teachers and parents.

Official Udemy global online course marketplace with 200,000+ video courses on coding, business, design, marketing and personal development. Frequent sales; free courses. Best for affordable on-demand learning.

Official Skillshare paid creative learning community with thousands of project-based classes on illustration, design, writing, video, music and freelancing. Paid subscription; free trial. Best for creative hobbyists.

Official Padlet digital bulletin-board collaboration tool that turns any prompt into a shareable visual board, used widely in classrooms and workshops. Free; paid Neon. Best for collaborative class discussions.

Official Wordwall free interactive quiz and game maker for teachers, used to turn worksheets into multiplayer classroom activities across many subjects. Free; paid Plus. Best for K-12 teachers.

Official The Open University OpenLearn free learning platform with hundreds of short university-level courses across arts, science, business and education. 100% free; paid certs. Best for self-paced adult learners.

Official Rewordify free reading helper that simplifies complex English, highlights hard words and helps ESL learners and struggling readers. 100% free; ad-supported. Best for ESL students and slow readers.

Official FutureLearn UK MOOC platform with short courses, microcredentials and full online degrees from top universities and cultural institutions. Free audit; paid certs. Best for UK-style continuing education.

Official Rosetta Stone paid immersive language learning platform with TruAccent speech recognition, live coaching and offline lessons for 25+ languages. Paid subscription. Best for serious long-term language study.

Official Udacity paid online learning platform focused on tech and AI Nanodegrees built with Google, AWS and Meta, with mentor support and career services. Paid; some free courses. Best for career switchers into AI and cloud.

Official Indian online learning platform for competitive exam prep (UPSC, IIT JEE, NEET, CAT, banking) with live classes from top educators. Free live classes and special lessons; paid subscriptions unlock full courses. Ideal for Indian aspirants preparing for government and engineering entrance exams.

Official Edmodo free K-12 learning platform with class pages, assignments, quizzes, parent accounts and a teacher community, run by Renaissance. 100% free. Best for K-12 teachers wanting a simple LMS.

Official Indian edtech platform offering video lessons, test prep and personalised learning for K-12, competitive exams and professional courses, with the BYJU'S app. Free sample lessons and app; full courses and tuition plans are paid. Best for Indian students preparing for JEE, NEET, CBSE and competitive exams.