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Coding

Code Academy
Provider of online courses on the most popular programming languages.
Code for Life
Nonprofit initiative that delivers free, open-source games that teach programming basics.
Code.org
Non-profit dedicated to expanding K-12 access to computer sciences.
Coursera
Lectures by world-class professors and reinforced through interactive exercises.
Dash
Free online courses in HTML, CSS, and JavaScript from General Assembly.
EdX
Computer science courses from top universities and institutions.
Hackr.io
Outstanding search engine for finding the best online programming courses and tutorials.
Hour of Code
Links to hundreds of one hour introductory coding activities and tutorials.
Khan Academy
Self-paced learning with extensive video library, interactive challenges, and assessments.
SoloLearn
Hundreds of text and video-based lessons on a dozen programming languages.
Stack Overflow
Large online community for programmers to learn, ask questions, and share knowledge.
Typing.com
Free, ad-supported platform teaching typing, online safety, and digital literacy.
W3Schools
Tremendous resource offering tutorials and reference material on HTML, PHP, SQL, and more.

Dictionaries

Abbreviations.com
Directory and search engine for acronyms and abbreviations.
Acronym Finder
Provides definitions for more than five million acronyms and abbreivations.
Cambridge
Search multiple dictionaries from Cambridge University Press.
Computer Language
Dictionary and encyclopedia including 25,000 entries and 6,000 images.
Definitions.net
Aggregates definitions from multiple respected dictionaries.
Dictionary.com
Includes definitions from American Heritage, Random House, and Merriam-Webster.
Law.com Dictionary
Concise, easy-to-understand definitions from The People's Law Dictionary.
Lexico (by Oxford)
English and Spanish dictionary and thesaurus from Oxford University Press.
Macmillan
British and American English dictionary and thesaurus.
MathWorld Dictionary
Source of mathematical definitions and concept explanations.
Merriam Webster
Based on the print version of Merriam-Webster's Collegiate Dictionary.
Merriam Webster Visual Dictionary
6,000 full-color illustrations; 20,000 terms with contextual definitions.
Net Lingo
Definitions for thousands of terms in the field of technology and communication.
Online Etymology Dictionary
Explanations of what our words meant and how they sounded hundreds of years ago.
OpenMD Medical Dictionary
Aggregator of medical definitions for 10,000+ medical concepts with images and pronunciations.
The Free Dictionary
General and subject dictionaries for financial, legal, and medical terms.
Thesaurus.com
Over 17,000 entries. Find synonyms, antonyms, and definitions.
Urban Dictionary
Dictionary of contemporary American slang. Not appropriate for children.
Visual Thesaurus
Displays a unique visualization of connections between words.
Vocabulary.com
Outstanding dictionary and engaging vocabulary teaching tool.
Webopedia
Easy-to-understand definitions for thousands of technology terms and acronyms.
Wiktionary
Multilingual dictionary and thesaurus written and edited by the public.
Word Spy
Blog tracking new words and phrases in popular use.
Wordflex (Oxford)
Builds dynamic trees that are filled with synonyms, antonyms, syntactical associations.
Wordnik
Aggregator of definitions, images, and word usage statistics.
Wordsmyth
Dictionaries, word tools, and an amazing illustrated dictionary for children.
YourDictionary
Definitions, thesaurus entries, spelling, pronunciation, and etymology results.

Educational Videos

Alison
Standards-based education material covering a broad range of subjects.
Amazon Education
Amazon Inspire is a free service for the discovery of digital educational material.
Big Think
Video interviews with 600+ thought leaders in a range of fields.
Brightstorm
Short-form online video lessons by professional educators. Free math lessons.
CosmoLearning
Aggregator of free, online video lessons and documentaries.
Coursera
Lectures taught by world-class professors and reinforced through interactive exercises.
EdX
Courses designed specifically for interactive study via the web.
Funbrain
Educational interactive content, with hundreds of free games, books, and videos.
FutureLearn
Offers a diverse selection of courses from leading European universities.
GCFLearn
Free online courses teaching basic life skills, technology, literacy, and math.
Howcast
Professional and user-generated how-to videos.
Internet Archive
Collection of more than two-hundred thousand free historical videos, many academic.
Khan Academy
Self-paced learning with extensive video library, interactive challenges, and assessments.
Learner.org
Professionally developed programming for K-12 classrooms by Annenberg Media.
Math TV
Professional video lessons in mathematics. Covers basic math through calculus.
MIT Open Learning
Lectures and course materials for students, teachers, and self-learners.
NeoK12
Aggregator of high-quality educational videos from around the Web.
NOVA
Episodes on a range of science topics, including nature, biology, physics, space, and math.
Open Yale Courses
Free access to a selection of introductory Yale courses.
OpenMD Medical Video Directory
Guide to the best sources of free medical videos, including procedures, operations, and lectures.
OVO Video
Video entries on an array of topics. Includes many video biographies.
PBS Kids
PBS programs including Sesame Street, Mister Rogers, Daniel Tiger, Curious George, and more.
PBS Video
Free videos from your favorite PBS programs, including NOVA and Frontline.
SchoolsWorld
Engaging professional videos and practical resources for educator development.
Socratica
Collection of high-quality videos covering math, science, and computer programming
Storyline Online
Celebrities reading children's books alongside creatively-produced illustrations.
TeacherTube
Online aggregator of educational videos.
TED
Fascinating presentations by the world's leading thinkers and doers.
WatchKnowLearn
Directory of over 50,000 free educational videos from around the web.
WonderHowTo
Search engine and directory of free how-to videos.
YouTube Learning
Free lectures from more than one hundred colleges and universities.

Encyclopedias

Britannica
Highly respected encyclopedia in publication since 1768. Features over 100,000 scholarly articles.
Catholic Encyclopedia
10,000 articles on Catholic history, interests, and doctrine.
Columbia Encyclopedia (via Infoplease)
Columbia's encyclopedia offers 57,000 entries.
Computer Desktop Encyclopedia
Features 20,000 topics and 2,500 images. Search field at bottom of page.
Credo Reference
Provides access to encyclopedia entries on thousands of topics.
Encyclopedia Mythica
Premier encyclopedia covering mythology, folklore, and religion.
Encyclopedia of Life
Database cataloging information on thousands of known species.
Encyclopedia of Philosophy
Hundreds of original contributions by philosophy experts and volunteers.
Encyclopedia of Symbols
Collection of signs and ideograms grouped by graphic characteristics.
Encyclopedia.com
Over 300,000 articles from sources like Oxford University Press and Columbia Encyclopedia.
Europeana
Digital collection of scientific and cultural texts, images, videos, and sounds.
How Stuff Works
Source for easy-to-understand explanations of how things work.
Larousse (French)
French language encyclopedia featuring 90,000 entries.
Medline Medical Encyclopedia (by ADAM)
Diseases, symptoms, injuries, and more with photographs and illustrations.
Reference.com
Encyclopedia aggregator. Sources include Columbia Encyclopedia and Wikipedia.
Scholarpedia
Peer-reviewed encyclopedia written by scholars from around the world.
Smithsonian
Online resources from the Smithsonian Institution.
Stanford Encyclopedia of Philosophy
Hundreds of refereed encyclopedia entries.
The Canadian Encyclopedia
More than 19,500 bilingual articles as well as timelines, classroom resources, and quizzes.
Who2
Encyclopedia of more than 3,000 famous people and fictional characters.
Wikipedia
Encyclopedia authored and edited by users. Features over 6,000,000 English entries.
World Book
Trustworthy, professionally-authored encyclopedia in print since 1917. Subscription required.
World Digital Library
Archive of cultural heritage artifacts from libraries, archives, and museums around the world.

Games

ABCya
Educational games for grades pre-K through 6 that will keep kids engaged and having fun.
ANTON
Learning app for K-4. Download the mobile app for the best experience.
Bini Bambini
Creator of art-focused early childhood education apps. Learn to read, write, and count.
CK-12
Free online modules covering science, math, social studies, and more.
Funbrain
Educational interactive content, with hundreds of free games, books and videos.
iCivics
Games, infographics, and videos that introduce students to American civics.
Kahoot
Free game-based classroom learning platform. Optional premium content subscriptions.
Khan Academy Kids
Free lessons by grade, printables, weekly planner, and remote learning support.
Mr. Nussbaum
Original and creative learning games in all subjects for kids in grades K-8.
PBS Kids
Educational games and videos featuring popular PBS characters like Curious George.
RV AppStudios
Creator of highly-rated educational apps like ABC Kids and Math Kids.
Sesame Street
Educational games and videos featuring Elmo, Cookie Monster, Abby Cadabby, Big Bird, and more.

Health & Medical

Department of Health and Human Services
Principal agency for protecting the health of U.S. citizens.
Drugs.com
Easy-to-read drug information and useful online tools including a pill identifier.
Epocrates
Point of care diagnostic and treatment information for doctors. Subscription required.
Everyday Health
Personalized health advice, tools, and communities.
Healthline
Publisher with extensive library of more than 20,000 health and wellness articles.
Mayo Clinic
Award-winning medical and health information for healthy living.
MedicineNet
Authoritative medical and wellness information for consumers.
Medline Plus
Diseases, symptoms, injuries, and more with photographs and illustrations.
Medpage Today
Latest clinical and policy coverage geared towards health care professionals.
Medscape
Medical information for specialists, physicians, and industry professionals.
Merck Manuals
The world's most widely-used medical guides.
NIH
Primary agency responsible for biomedical and public health research in the United States.
OpenMD
Health search engine spanning thousands of medical organizations and government databases.
RxList
Drug information for consumers and health professionals.
U.S. Centers for Disease Control and Prevention
Public health agency dedicated to the control and prevention of disease and injury.
UpToDate
Evidence-based clinical decision support resource for health care providers.
WebMD
Comprehensive consumer health information site.

Literature

AdLit.org
Adolescent literacy resources for parents and educators of kids in grades 4-12.
Amazon.com
Leading retailer with extensive catalog of book details, reader reviews, and full-text search.
Audible
Premier online audiobook retailer with affordable subscription options.
BnF Gallica
Digital library of the National Library of France and its partners. Access to several million documents.
Booknotes
Online archive for C-SPAN's award-winning author interview program. 800+ interviews.
CliffsNotes
Free literature notes and study guides covering all academic subject areas.
CommonLit
Two thousand high-quality free reading passages complemented by assessments and reports.
Google Books
Searchable full-text database of millions of books scanned by Google.
Library of Congress
Largest library in the world with a collection of more than 120 million items.
LibriVox
Free audio versions of books from the public domain read by volunteers.
Literary Hub
Publisher of news and ideas on contemporary literary life. Extended book excerpts and reviews.
New York Public Library
One of the largest public libraries in the United States. Collection of 51 million items.
Open Library
One web page for every book ever published. Currently indexes 24 million books.
OpenStax
High-quality, peer-reviewed, openly-licensed textbooks that are absolutely free online.
Project Gutenberg
Collection of 60,000 free public domain ebooks. Read on your PC, iPhone, Kindle, etc.
TeachingBooks
Massive curated collection of books, audiobooks, and related instructional materials. Registration required.
The British Library
UK's leading research library cataloging 15 million books, newspapers, and journals.
Wikibooks
Free library of educational textbooks that anyone can edit.
WorldCat
Search local library collections. Indexed from more than 10,000 libraries.

Mathematics

Abacus
Detailed introduction to the Abacus. History, interactive tutorial, and more.
AMSER
Applied math and science education repository with links to outstanding resources.
Brightstorm: Math
More than 2,000 short-form online video lessons by professional math teachers.
Brilliant
Interactive challenges that build quantitative skills in math, science, and computer science.
CanFigureIt Geometry
Interactive workspace where students can practice geometry proofs and exercise deductive reasoning.
Coolmath 4 Kids
Games, lessons and more, designed to teach math to children 12 and under.
Double Division
Very creative variation on long division that reduces common frustrations.
Euclid
Theoretical and applied mathematics and statistics journals.
Figure This!
Interesting math challenges for middle school students to try at home.
Free Math Help
Math lessons, math games, and homework help message boards.
Illuminations
Math resources for teachers, educators, and administrators.
Inside Mathematics
Video lessons and worksheets aligned with Common Core standards. Exceptional resource.
LibreTexts: Math
Open access textbooks in math, science, and the humanities.
Math Dictionary for Kids
Very creative and concise guide to hundreds of math concepts.
Math Planet
High school math courses in Pre-Algebra, Algebra 1, Algebra 2 and Geometry.
Math TV
Professional video lessons in mathematics. Covers basic math through calculus.
Microsoft Math Solver
Step-by-step solutions to math problems with camera-based import option.
Plus Magazine
Articles on mathematics and its applications to science, art and society.
QANDA
Step-by-step solutions to math problems. Optional mobile app for photo input.
Socratic by Google
Visual explanations of important concepts in math, science, literature, and more.
SplashLearn
Highly engaging and personalized math learning programs organized by grade level.
Stack Exchange: Mathematics
Online math question-and-answer site with an active community.
That Quiz
Hundreds of free online quizzes to test your math knowledge.
Triple A Math
Interactive math lessons on subjects ranging from addition to exponents.
WebMath
Generates easy-to-understand explanations to math problems in real-time.
Wolfram MathWorld
Authoritative resource for math definitions and explanations of concepts.

News Sites

Agence France Press
Largest French news agency and a leading global news wire.
Associated Press
Global news network. Source for thousands of news outlets.
BBC News
Britain's leading news agency providing news, analysis, and insight.
Bloomberg
Global financial data, news, and analytics.
CNN
Among the world's leaders in news and information delivery.
Reuters
Leading international news organization. Established in London in 1851.

Publishing

Educreations
Record, narrate, and share screencasts from an iPad.
Google Docs
Create and share online documents, forms, presentations, and spreadsheets.
Issuu
Collect, share and publish digital documents and magazines.
Prezi
Presentation software that uses motion and zoom to relate concepts and bring ideas to life.
SlideShare
Share presentations online. Sync audio and backup original files.
VoiceThread
Web-based tool for creating and narrating multimedia slideshows.

Science

Biodiversity Heritage Library
Digital library of open access global biodiversity literature.
BioEd Online
STEM lessons, activities, and teaching guides from Baylor College of Medicine.
bioGraphic
Articles and videos discussing sustainability and the wonders of nature.
California Academy of Sciences
Engaging lesson plans, videos, and activities that make science exciting for kids.
Discover Magazine
The latest news, theories, and developments in the world of science and technology.
DK Find Out
Interactive learning activities for kids about dinosaurs, space, animals, nature, and more.
Exploratorium
Content and activities exploring science, art, and human perception.
Fact Monster
Easy-to-read entries on math, science, people, history, and current events.
Frontiers for Young Minds
Expert-authored scientific articles guided by feedback from young readers.
HHMI BioInteractive
Big ideas in biology presented as videos and interactives with free teaching resources.
How to Smile
Curated collection of STEM activities sorted by age, learning time, and cost of materials.
LibreTexts
Nearly 400 open access textbooks in math, science, and the humanities.
NASA Jet Propulsion Laboratory
Exceptional collection of science activities organized by grade level and topic.
National Geographic Education
Interactive lessons, maps, and teaching resources. Filter by topic, format, or grade.
National Geographic Kids
Kid-friendly articles and videos about animals, climate, science, and space.
National Science Digital Library
Science, technology, and engineering materials. Filter by subject, education level, and standard.
Nautilus
Intriguing essays and investigations into science, biology, sociology, and culture.
NOVA
Episodes, articles, and podcasts covering nature, biology, physics, space, and math.
PlantNet
Identify, explore, and share observations of wild plants using the website or mobile app.
Project Noah
Community submitted photographs of animals in their natural habitats.
Quanta Magazine
Developments in mathematics, theoretical physics, computer science, and life sciences.
Science ABC
Fun and interesting science questions that ignite children's imagination and curiosity.
Science Friday
Educational videos, articles, and podcasts about science, technology, and other cool stuff.
Science News for Students
Publication providing age-appropriate, topical science news to learners and educators.
Scientific American
Explores research and ideas in science, health, technology, and the environment.
Smithsonian Magazine
Insights and stories about science, history, art, and innovation.
Smithsonian Science Education Center
K-12 learning modules, STEM curriculum, and professional development material.
Socratic by Google
App that offers visual explanations of math and science concepts. Includes text and speech recognition.
SuperSTAAR
Teaching and assessment resources from Baylor College of Medicine.
Wonderopolis
Daily answers to community questions about culture, science, math, language, and history.

Software

Adobe
Expansive library of top-tier development and creativity applications.
Audacity
Free, easy-to-use audio editor with robust recording, editing, and conversion tools.
Canva
Cloud-based drag-and-drop design tool with thousands of templates and collaborative tools.
Diagrams.net
Open source diagramming tool. Easily create flow charts, process diagrams, and more.
Google Docs
Create and share online documents with live collaborative editing and commenting tools.
Microsoft Office
Leading productivity suite from Microsoft featuring Word, Excel, PowerPoint, and Outlook.
Open Office
Open-source productivity suite from Apache for word processing, spreadsheets, and presentations.
TechSmith
Inexpensive, easy-to-use screen capture and recording software.
ZOHO
Free online productivity and collaboration apps.

Teacher Resources

AdLit.org
Multimedia resource library for parents and educators of kids in grades 6-12.
American Association of Chemistry Teachers
Labs, animations, and resources for chemistry teachers. Reasonable annual subscription required.
Better Lesson
Free, comprehensive lesson plans covering critical subjects for grades K-12.
CK-12
Time-saving teaching tools and free textbooks for K-12 educators.
Ed Helper
Worksheets and teacher resources organized by subject matter and grade.
EdShelf
Socially-curated directory of educational websites, mobile apps, and desktop programs.
EDSITEment
Lesson plans and teaching resources for humanities education.
Education World
Worksheets, lesson plans, templates, daily columns, and other content for educators.
Edulastic
Standards-aligned system for assessments, assignments, and progress monitoring.
Edutopia
Educational content, activities, and ideas plus advice for parents and teachers.
Exploratorium
Engaging content that explores the world through science, art, and human perception.
Freckle
Differentiated instruction across math, ELA, social studies, and science.
Google Classroom
Free platform for creating, distributing, and grading assignments using Google Cloud.
HippoCampus
Multimedia lessons and course materials for students in middle school through college.
Inside Mathematics
Exceptional video lessons and worksheets aligned to the Common Core standards.
Khan Academy Kids
Free lessons, printables, remote learning support, and weekly planners. Sorted by grade level.
KidsKonnect
Library of printable worksheets for teachers and homeschoolers across all subjects.
Learning A-Z (Subscription)
Broad selection of literacy curriculum materials for grades K-5. Free samples available.
National Center for Families Learning
Free resources to meet different literacy and education challenges sponsored by the DOE.
National Geographic: Resource Library
Exceptional collection of educational materials sorted by topic, format, and grade.
Open Educational Resources
Network where teachers and professors can access and share course materials.
OpenLearn
Free access to thousands of Open University courses, interactives, and videos.
PBS Learning Media
Standards-aligned classroom materials for PreK-12 education.
PhET
Interactive science and math simulations with complementary video primers and teaching tips.
Reading Rockets
Research-based strategies for helping young children become strong, confident readers.
ReadWriteThink
Lesson plans, interactives, and professional development resources.
Scholastic For Teachers
Lesson plans, student activities, and video clips for teachers.
Seesaw
Well-designed classroom management platform. Interactive activities and background assessments.
Smithsonian Science Education Center
K-12 learning modules, STEM curriculum, and professional development resources.
Super Teacher Worksheets
Printable worksheets and activities for teachers, parents, tutors, and homeschool families.
SuperSTAAR
Science teaching and assessment resources from Baylor College of Medicine.
Teacher Vision
Classroom-ready lesson plans, printables, and resources.
Teachers First
Collection of lessons, units, and web resources in a user-friendly and ad-free format.
Teachers.net
Social tools, lesson plans, and an advice column for teachers.
Teachnology
Online resources for educators including worksheets, lesson plans, rubrics, and more.
TED Ed
Build a lesson around a video. Select from TED-Ed Originals, TED Talks, or YouTube videos.
Vision Learning
In depth modules on a range of science, technology, engineering, and mathematics topics.
WNET Education
Lesson plans, classroom activities, multimedia, and links to curriculum-based sites.
Word Wall
Create interactive quizzes, match ups, word games, and more.
Zearn
800+ digital lessons organized by curriculum and grade-level assessment.
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