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Science 

  1. Anti-Paywall  A browser extension that maximizes the chances of bypassing paywalls.
  2. 100,000 Stars  Interactive 3D visualization of the stellar neighborhood, including over 100,000 nearby stars
  3. Academiaedu  Social networking website for academics
  4. Academic Torrents  Distributed, scalable, secure, fast system for sharing and downloading large datasets
  5. Ancient Earth Globe  Explore what Earth looked like up to 600 million years ago
  6. Augmented-Reality Sandbox  Real-time integrated augmented reality system to physically create topography models
  7. Climate Data Online (National Climatic Data Center)  Archive of global historical weather and climate data
  8. Core  Offers seamless access to millions of open access research papers
  9. Cosmos: A Personal Voyage (Streaming 24/7)  Constant stream of Carl Sagan's 1980 television series
  10. Directory of Open Access Journals  Community-curated directory that indexes and provides access to high quality, open access, peer-reviewed journals
  11. Dynamic Periodic Table  Dynamic Periodic Table of Elements
  12. Einstein for Everyone  Resource for aiding understanding the significance of Albert Einstein's work
  13. ​Engineering Toolbox  Resources, tools and basic information for engineering and design of technical applications
  14. EPA Environmental Dataset Gateway  View data from the EPA's environmental resources
  15. Eyes in Space  View Earth from space in virtual reality
  16. Fractal Lab  Interactive WebGL fractal explorer
  17. Fractal Visualizer  Interactive flight through formula-generated 3D space
  18. Google Earth  3D
  19. Google Earth VR
  20. Google Maps - Planets
  21. Google Scholar
  22. How Fast Are You Moving  View your current relative speed through space at various levels
  23. If the Moon Were Only 1 Pixel  View the scale of space if the moon were 1 pixel in size
  24. Interactive Periodic Table  Minimalistic presentation of the periodic table, providing useful information about different elements, for people to use for education or for reference
  25. JPL's Open Source Build-It-Yourself Rover  Learn to build robots: Build your very own Mars rover at home!
  26. Library Genesis  Search engine for articles and books on various topics, which allows free access to otherwise paywalled content
  27. Mapping Sea-Level Changes  Interactive data visualization and simulation tool for viewing Earth's changing sea levels
  28. Math Art  Art inspired by the beauty of mathematics
  29. Mathematical Imagery  Galleries containing renderings of various mathematical concepts
  30. NASA Earthdata  View NASA's Earth science data
  31. NASA Worldview  Interactively browse global satellite imagery within hours of it being acquired
  32. NASA's Eyes  Experience Earth and our solar system, the universe and the spacecraft exploring them
  33. NOAA View Global Data Explorer  Interactively view Earth via satellite images, climate models, and other observation devices
  34. OneZoom Tree of Life Explorer  Interactive model which uses fractals to condense the entire tree of life into a single, zoomable page
  35. Open Knowledge Maps  A visual interface to the world's scientific knowledge
  36. Open Science Framework  A scholarly commons to connect the entire research cycle
  37. RapidTables  Online scientific and engineering resource
  38. Sci-hub  Search engine for scientific papers and articles available for direct download, bypassing ordinary paywalls
  39. Science Direct  Subscription-based access to a large database of scientific and medical research
  40. Solar System Exploration (NASA)  Real-time, living encyclopedia of robotic exploration of our solar system
  41. Space Dashboard  Collection of a select few live happenings in space
  42. Space Engine  Free virtual Universe simulator
  43. Stuff in Space  Track 1000s of satellites, spent rockets, and debris as they orbit Earth in real time
  44. TimeTree  Searchable public knowledge-base for information on the evolutionary timescale of life
  45. Unpaywall  An open database of 17 million free scholarly articles
  46. Vital Signs of the Planet (NASA)  Before-and-after images of locations on planet Earth, showing change over time periods ranging from centuries to days
  47. VR Landscapes Explore Mind-Bending Geometry  Article about eleVR virtual landscape featuring hyperbolic geometry
  48. WebGL Fluid Experiment  Interactive fluid simulation
  49. WebGL Globe  An open platform for geographic data visualization
  50. Wikiverse  A galactic reimagining of Wikipedia
  51. World Population Clock  Live view of various statistics relating to human population ​

Math

  1. Betterexplained : A website that explains maths concepts in very intuitive way so you don't have to memorize them.⭐️​
  2. Seeing Theory: A visual introduction to probability and statistic⭐️
  3. Philosophy Maps​
  4. Desmos: Graph functions, plot data, evaluate equations, explore transformations, etc. for free.
  5. Brilliant  Master key ideas in math, science, and computer science through problem solving
  6. Cymath  Math problem solver with steps
  7. eleVR - Hyperbolic VR  A project exploring non-Euclidean geometry using virtual unreality Observe and navigate several classic hyperbolic tilings
  8. fxSolver: A solver for engineering and scientific equations.
  9. ​Mathigon  Discover Mathigon, a groundbreaking new education platform that adapts to every individual student.
  10. Mathway  Quality on-demand math assistance.
  11. algebrarules.com/ : The Most Useful Rules of Basic Algebra​
  12. Online Math Tools  World's simplest collection of useful mathematics utilities. Generate number sequences, draw fractals, do quick matrix and numerical calculations and more!​

History

http://www.fsmitha.com : MACROHISTORY

Philosophy

Philosophybasics.com

Other

Argument Analysis Platform: Create and analyze argument maps online.
Brainly: Study together.
Debatepedia: The Wikipedia of debates.
Diffen: Compare Anything.
Earth Resource Trade: Exploring interdependencies in global resource trade.
Explain that Stuff: A collection of free, easy-to-understand science, technology, and how-it-works articles for the whole family.
Explorable Explanations: A hub for learning through play.
Free Video Lectures: Free video lectures, tutorials, and courses.
Global Network of Discovery: Using the latest technological advances to help us all discover more and better things.
Globe of Economic Complexity: Visualize $15 Trillion of World Exports.
Google Arts and Culture: Explore collections and stories from around the world.
Google Classroom: Streamlines assignments, boosts collaboration, and fosters seamless communication to make teaching more productive and meaningful.
Google Public Data Explorer: Explore, compare, and share large visualized datasets.
Infoplease: Online Encyclopedia, Almanac, Atlas, Biographies, Dictionary, and Thesaurus.
Institute of Art and Ideas: Free access to cutting edge ideas and some of the world's leading thinkers.
Learn Anything: Platform for efficient knowledge discovery.
National Geographic: A world leader in geography, cartography, and exploration.
Open Culture: Some of the best free cultural and educational media on the web.
Our World in Data: Explore how and why living conditions around the world are changing rapidly.
Quizlet: Quizlet makes simple learning tools that let you study anything. Start learning today with flashcards, games and learning tools — all for free.
Rewordify: Free, online tool to simplify difficult English.
Snopes: Reference source for fact-checking.
Stack Exchange: Network of over 100 question/answer communities.
Study Blue: Find, create, and study online flashcards and notes.
Take Me Back To: Find out what the world looked like in any date in the past: just type in your special date and enjoy the time-machine.
TED: Influential videos from expert speakers on many subjects.
The History of Philosophy: Visualized summaries of various philosophers, ideas, and their connections.
TV Tropes: Wiki / catalog for plot devices and tropes in all forms of media.
Unimersiv: Virtual Reality Education.
Video Lectures: Exchange ideas and share knowledge.
Watch Know Learn: Free educational videos for K-12 students.
World Population History: Explore the history of human population and its effects.
Zotero: Free and easy tool to help you collect, organize, cite, and share research resources.

Learning

  1. ​Argument Analysis Platform  Create and analyze argument maps online.
  2. Big Think  Useful articles from experts to help you succeed.
  3. Brainly  Brainly is the knowledge-sharing community where 150 million students and experts put their heads together to crack their toughest homework questions.
  4. Debate.org - Research today’s most controversial debate topics and cast your vote on our opinion polls.
  5. Debatepedia  The Wikipedia of debates.
  6. Desmos  Graph functions, plot data, evaluate equations, explore transformations, etc. for free.
  7. Diffen  Compare Anything.
  8. Disagree With Me  Seek out and provide opposing viewpoints.
  9. Do It Yourself  DIY home improvement information.
  10. ​Dokieli  Dokieli is a client-side editor for decentralised article publishing, annotations and social interactions.
  11. Earth Resource Trade  Exploring interdependencies in global resource trade.
  12. ​Everipedia  Everipedia's IQ Network is the world's first Encyclopedia that allows anyone to become a stakeholder in the system and earn rank, rewards & tokens for curating content.
  13. Explain that Stuff  A collection of free, easy-to-understand science, technology, and how-it-works articles for the whole family.
  14. Explorable Explanations  A hub for learning through play.
  15. Flip To Mind  Spaced repetition app to help you remember everything you learn.
  16. Fora TV  Videos from some of the world's best conferences and events.
  17. Free Video Lectures  Free video lectures, tutorials, and courses.
  18. fxSolver  A solver for engineering and scientific equations.
  19. Global Network of Discovery  Using the latest technological advances to help us all discover more and better things.
  20. Globe of Economic Complexity  Visualize $15 Trillion of World Exports.
  21. Google Arts and Culture  Explore collections and stories from around the world.
  22. Google Classroom  Streamlines assignments, boosts collaboration, and fosters seamless communication to make teaching more productive and meaningful.
  23. Google Public Data Explorer  Explore, compare, and share large visualized datasets. ​
  24. Infoplease  Online Encyclopedia, Almanac, Atlas, Biographies, Dictionary, and Thesaurus.
  25. Institute of Art and Ideas  Free access to cutting edge ideas and some of the world's leading thinkers.
  26. Instructables  Learn how to make anything.
  27. Iodide  An experimental tool for scientific communication and exploration on the web
  28. JSTOR Labs Text Analyxer  Text Analyzer is a new way to search for articles and books on JSTOR by uploading any document.
  29. Learn Anything  Platform for efficient knowledge discovery.
  30. Libib  A website & app that catalogs books, movies, music, and video games ​
  31. National Geographic  A world leader in geography, cartography, and exploration.
  32. ​Open Culture  Some of the best free cultural and educational media on the web.
  33. Open Learning Initiative  Transforming higher education through the science of learning.
  34. OpenLaw  We are home to a passionate group of people, technologists, and dreamers committed to rebuilding the legal industry.
  35. OpenLearn  Free online learning from The Open University. OpenLearn gives you free access to course materials and expert opinion on topical issues.
  36. Our World in Data  Explore how and why living conditions around the world are changing rapidly.
  37. Quizlet  Quizlet makes simple learning tools that let you study anything. Start learning today with flashcards, games and learning tools — all for free.
  38. Rewordify  Free, online tool to simplify difficult English.
  39. Snopes  Reference source for fact-checking.
  40. ​Study Blue  Find, create, and study online flashcards and notes.
  41. Take Me Back To  Find out what the world looked like in any date in the past: just type in your special date and enjoy the time-machine.
  42. Teach Yourself  Teach yourself using various courses.
  43. TED  Influential videos from expert speakers on many subjects.
  44. The History of Philosophy  Visualized summaries of various philosophers, ideas, and their connections.
  45. TV Tropes  Wiki / catalog for plot devices and tropes in all forms of media.
  46. Unimersiv  Virtual Reality Education.
  47. Video Lectures  Exchange ideas and share knowledge.
  48. Watch Know Learn  Free educational videos for K-12 students.
  49. ​Wolfram Alpha  Computational knowledge engine.
  50. World Population History  Explore the history of human population and its effects.

Free Online Courses &
Lectures

  1. AcademicEarth  Free online courses from top colleges
  2. Academo  Interactive, educational demos and tools
  3. Carnegie Mellon University  High-quality courses provided to help transform higher education
  4. ChalkStreet  Online learning marketplace which provides high quality courses from great teachers
  5. Class Central  Search Engine for Free Online Courses
  6. Classical Mythology (Video Lectures Series)  By Dr Elizabeth Vandiver, a Professor of Classics from University of Maryland, College Park
  7. Cosmo Learning  Educational website for students and teachers
  8. Course Hero  Study resources, course notes, test prep, homework help, tutors
  9. CourseNotes  Free notes, outlines, vocab terms, study guides, practice exams, and more
  10. ​Courseroot  The biggest database of online courses for you to filter through based on price, difficulty, certificate quality, and more
  11. edX  1,600 courses from 100+ leading institutions
  12. Future Learn  Courses from top universities and specialist organizations
  13. iTunes Stanford University  Collection of audio and video content from Stanford University
  14. Khan Academy  Expert-created content and resources for every subject and level
  15. Lecture Search  Curated search engine for quality lectures, interviews, documentaries, speeches
  16. MIT University Opencourseware  Course notes, videos, instructor insights and more
  17. Online Berkeley Lectures  Berkeley lectures on a variety of subjects
  18. Open Education Consortium  Resources, tools and practices that employ a framework of open sharing
  19. Open Yale Course  A selection of intro courses from Yale University
  20. OpenCourser  8,900+ courses from leading schools and universities
  21. OpenLearn  Course materials and expert opinion on topical issues
  22. OpenStax  View, share, and freely adapt educational materials such as courses, books, and reports
  23. Saylor Academy  Nearly 100 full-length courses at the college and professional level
  24. Tufts University  Open educational resource for faculty, students, and self-learners
  25. University of the People  Non-profit, tuition-free, accredited American university
  26. University of Washington  Courses in Computer Science and Engineering
  27. Yale on YouTube  Video lectures from Yale University
  28. YouTube EDU  Highly-rated YouTube videos on various subjects

Text Tools &
Notepad

  1. AIO Text Tools  Text manipulation made easier. ​
  2. Calmly Writer  Customizable in-browser text editor. ​
  3. Cowyo  Note-taking application.
  4. ​Docracy  Free crowdsourced legal document templates.
  5. Eddtor  Write, edit, and save text documents. ​
  6. iRuler  Online ruler which detects screen size to display correctly.
  7. Joplin  An open source note taking and to-do application with synchronisation capabilities.
  8. Memrey  Memrey is the future of the notepad. An advanced notepad for creative minds.
  9. ​New Text Document  We provide very simple and powerful tools for creating, editing and sharing text documents.
  10. Notepin  Create your own notebook without any signup required.
  11. Notes.io  Take notes and share with others by providing the shortened url to a friend.
  12. ​​QuickNote  Minimalist, Free & Anonymous Note Taking App
  13. QuillBot  Quillbot is a state-of-the-art artificial intelligence that will completely reword and restructure full sentences and paragraphs.
  14. Simplenote  The simplest way to keep notes. Light, clean, and free.
  15. ​Slick Write  Check your writing for grammar errors, stylistic mistakes, et cetera.
  16. Snippetnote  Snippetnote is a note-taking app that makes your snippets easily viewable, accessible, and copy-and-pastable.
  17. Sort My List  Online word tool with various options to sort text.
  18. Standard Notes  A safe a place for your notes, thoughts, and life's work.
  19. Text Convert  Perform various text conversions.
  20. ​TextShaker  Text transformer with many useful tools.
  21. Trix  A rich text editor for everyday writing.
  22. WikidPad  A Wiki-like notebook for storing your thoughts, ideas, to-do lists, contacts, or anything else.
  23. ​​Your Note  A note-taking app that puts users' data first. Never lose your notes again.
  24. ZeeMaps  Create and publish interactive maps.
  25. ZenPen  Minimalist writing zone with various tools.

Organize information

​

How thing works

Learn ​ HTML / CSS

Learn Subjects Easy

  1. econgraphs.org : Intuitive interactive visualizations of key concepts in economics​
  2. periodicstats.com/ : A clean, modern, interactive periodic table
  3. databasic.io : A suite of easy-to-use web tools for beginners that introduce concepts of working with data.​​
  4. codingame.com/ : Learn to code writing a game
  5. photoskop.com/ : Interactive photography lessons - learn about exposure, depth of field, ISO, white balance
  6. ​allaboutcircuits.com/educat... : Site where you can learn all about electrical circuits and how they work.
  7. ​ann.miabellaai.net/ : Neural network playground: Try different setups and see how the networks develop. 
  8. ​musictheory.net/lesson... : Learn how to read sheet music (no frills, piano-based interactive lessons)​
  9. ​Math is Fun
  10. Usefulscience
  11. Biointeractive
  12. No Excuse List
  13. learnsomethingnew.co
  14. Wolfram
  15. Bettersolutions
  16. Lawcomic.net
  17. Free Online Courses
  18. Explorer.opensyllabusproject
  19. Cell Biology Animation
  20. Films for Action​
  21. MovieClips
  22. DIY Genius
  23. Discovery​
​

WORDS
WordNet Search: A Lexical Database for English

Language & Translation

  1. 3peat  Type words and view translations in 3 languages of your choice
  2. BBC Languages  Free online lessons and information
  3. Clozemaster  Language learning through mass exposure to vocabulary in context
  4. DeepL Translator  Use the free DeepL Translator to translate your texts with the best machine translation available, powered by DeepL's world-leading neural network technology Currently supported languages are English, German, French, Spanish, Italian, Dutch, and Polish
  5. Duolingo  Learn a variety of languages for free
  6. DuoReading  Learn a language by viewing text side-by-side with your native language
  7. EmojiStone  Play with emojis to learn words in new languages
  8. FlashAcademy  Adaptive learning, translator, and games
  9. Flowlingo  Learn for free by immersing yourself in TV, movies, music, books, news,
  10. Forvo  The pronunciation dictionary
  11. Google Translate  Free instant translation tool
  12. LanguageTool  LanguageTool is a free proofreading software for English, German, Spanish, Russian, and more than 20 other languages
  13. Lexicity  Comprehensive index for ancient language resources
  14. Lingvist  Learn many languages with customized, adaptive learning materials
  15. Lingvo  Detailed information about all 24 official EU languages
  16. Mate Translate  App for text and speech which can translate 103 languages
  17. Memrise  Learn various languages for free or pay for advanced features
  18. Modole  Draft a composition in the language you're learning and receive corrections from a community of language learners
  19. MyLanguages  Focuses on grammar and vocabulary, and offers a variety of tools
  20. Online Etymology Dictionary  Explanations of word origins, meanings, and how they sounded in the past
  21. Parallel Text  Read books with side-by-side language viewer
  22. Signing Savvy  ASL sign language video dictionary with other tools
  23. Treegle  An interactive dictionary

📽️ Documentary

  1. Documentary Storm  Watch free documentaries online.​
  2. Rocumentaries
  3. DocumentaryHeaven
  4. Documentary Addict
  5. Top Documentary Films
  6. Documentary.net

Programming Resources 

Devdocs - Programming documentation
Feditor - Code editor
Dillinger.io - Markdown Editor
Regex101 - Online regex tester

Big Thinking

Big Think: Useful articles from experts to help you succeed.
Fora TV: Videos from some of the world's best conferences and events.
​

History & Philosophy And Culture

  1. denizcemonduygu.com/philo/... : The History Of Philosophy
  2. Map of Contemporaries : Who was alive, when, and where?
  3. ​Histography : One of the most detailed timelines of everything throughout history​​
  4. The Map as History: View animated historical maps 
  5. ​Chronas How did the world look like when...​
  6. Royal Constellations : A 1000 years of ancestral connections in the European royal families
  7. Pantheon - Mapping Historical Cultural Production
  8. timeglobe : Explore the history of the world through over 20,000 events
  9. Epic History TV : EPIC HISTORY TV brings you history's most dramatic and awesome events, from giant conflicts like World War One to the epic history of nations such as Russia,...
  10. The Flow of History : A Dynamic and Graphic Approach to Teaching History
  11. ​worldpopulationhistory.org/
  12. ​American Panorama : An Atlas of United States History
  13. ​Music Timeline : Explore music history
  14. Fleximize.com ​The Careers of the Founders

🚸 💻 ​Programming for Kids

Pre-Literate

  • The Foos - A funny, pre-literate iPad game that teaches concepts for commands, parameters, loops, and conditionals.
  • Scratch Jr. - An app that teaches young kids how to visually code interactive stories and games. A simplified version of the Scratch website, for a tablet.
  • Cubetto - An expensive, yet screen-free introduction to coding especially for a Montessori environment. Includes a robot and a wooden programming board with removable command pieces.

Upper Elementary

  • DIY.org - An online community for kids to learn anything. Programming skills listed are App Dev, Backend Dev, Frontend Dev, Game Dev, Graphic Designer, Open Sourcerer, Scratcher, Sys Admin, and Web Designer.
  • Bitsbox - A monthly box subscription that teaches kids how to code.
  • CS Unplugged - A collection of free learning activities that teach Computer Science through engaging games and puzzles that use cards, string, crayons and lots of running around.
  • Lauren Ipsum - A book that teaches problem-solving concepts in the context of programming. Sample chapters available online.
  • Lego Mindstorms - A robotics kit by Lego.
  • Ruby Warrior - An online tutorial-game with cool music that teaches Ruby programming.
  • Swift Playgrounds - Apple's fun iPad app for learning Swift.
  • Khan Academy - Computer Programming - A series of web-based programming lessons with interactive challenges, by Khan Academy. Teaches topics like animation, game development, and web programming. Users can post questions, which get answered quickly by the community.
  • Web Design for Kids - A series of tutorials teaching children the basics of designing and building a website with HTML and CSS.
  • Finch Robot - A small robot designed for computer science education with support for multiple programming languages.
  • Secret Coders - A engaging book series that teaches programming concepts through Logo.

Lower Elementary

  • Lightbot - Solve puzzles with commands, loops, and conditionals. Comes in Lightbot and lightbot Jr, and a mobile app or a desktop website.
  • Cargo Bot - iPad app to solve problems with constraints using commands, loops, conditional statements. More difficult puzzles than Lightbot.
  • Code.org - A website with interactive coding games and courses for kids. Covers a large range of ages and skill levels.
  • Scratch - Scratch is a popular visual programming language for beginners, created by MIT. The Scratch website is a platform for kids to make interactive stories and share them with each other.
  • Code Master - An addictive board game that builds problem solving skills and understanding of programming logic. Starts basic and moves to very advanced.