ATLASES
http://www.educationatlas.com  Education Atlas.  Welcome to the Education Atlas®, the World's most comprehensive guide to the best education sites on the Web. They're sorted by Education Index/Subject and lifestage, so you can find exactly what you're looking for quickly and easily. 

DICTIONARIES
http://www.alphadictionary.com/index.shtml AlphaDictionary.  Enter a word to search for dictionary web sites that include that word. Enter a pattern consisting of letters and wildcards to search for words.

http://www.bartleby.com/61/ The American Heritage Dictionary of the English Language, Fourth Edition. 2000.

http://dictionary.reference.com Dictionary.com   Free online dictionary search, translator, word of the day, crossword puzzles and word games, and much more.

http://www.lexicool.com  Directory of Bilingual and Multilingual Dictionaries.  The directory currently has links to over 1000 translation dictionaries and glossaries

www.english-dictionary.us English Dictionary

http://www.eduref.org  Educator’s Reference Desk.  The Educator's Reference Desk builds on over a quarter century of experience providing high-quality resources and services to the education community. From the Information Institute of Syracuse, the people who created AskERIC, the Gateway to Educational Materials, and the Virtual Reference Desk, the Educator's Reference Desk brings you the resources you have come to depend on. 2,000+ lesson plans, 3,000+ links to online education information, and 200+ question archive responses

http://www.factbites.com FactBites  A combination Search Engine and Dictionary

www.factmonstor.com Fact Monster

www.infovisual.info  InforVisual

www.itools.com/lang  iTools for language Includes dictionaries, thesaurus, and language translation 

www.littleexplorers.com/dictionary.html  Little Explorers Picture Dictionary. (PK-6)  This site is an online picture dictionary with over 1800 entries and related Web sites.

www.lingro.com Lingro   Knowledge and information essential to human communication and interaction should be free and accessible to everyone. This is why we created the most comprehensive set of free dictionaries available under open licenses so that anyone can contribute, download, redistribute, and modify the dictionaries for their own needs. These licenses guarantee that they will always remain free and useful to society. This site also includes the best dictionaries, you need to have the best tools.

 www.onelook.com OneLook Dictionaries.  This site’s purpose is to encourage people to use Internet glossaries and dictionaries.  The OneLook® Dictionaries page provides two approaches to finding definitions for a word.  Search the OneLook® Dictionary indexes for the word you seek. This will provide links to dictionary webpages that include the word.

www.oed.com  Oxford English Dictionary  The Oxford English Dictionary is the accepted authority on the evolution of the English language over the last millennium. It is an unsurpassed guide to the meaning, history, and pronunciation of over half a million words, both present and past. It traces the usage of words through 2.5 million quotations from a wide range of international English language sources, from classic literature and specialist periodicals to film scripts and cookery books.

 www.oxfordreference.com Oxford Reference Online  Oxford Reference Online: The Core Collection brings together 100 well-known and trusted dictionaries and reference books into a single cross-searchable web database for the first time. Subscription service.

www.m-w.com/netdict.htm Merriam Webster Online Dictionary and Thesaurus.

www.memidex.com  Memidex  This site has an online dictionary and thesaurus with a sinmple interface, complete inflection, atuo-suggest, adult-filtering, frequent updates, a browsable index, and support for handheld/mobile

http://rhymezone.com  RhymeZone. (6-12) This is by Lycos and has an online dictionary where you can type in words to find rhymes, synonyms or antonyms.

www.unixl.com   UNIXL.  An online university and educational directory. 

www.visuwords.com VisuWord INTERACTIVE( 6-12) An online graphic dictionary

www.visualthesaurus.com Visual Thesaurus INTERACTIVE (6-12)  The Visual Thesaurus is an interactive dictionary and thesaurus with an innovative display that encourages exploration and learning. You'll understand language in an exciting new way. 

http://visual.merriam-webster.com Visual Dictionary

http://www.webster-dictionary.org/  Webster Dictionary 

www.webopedia.com Webopedia  Computer and Internet definitions

http://www.wordcentral.com/ Word Central  Student dictionary and rhyming dictionary online at Merriam-Webster's website.

www.wordsmyth.net  Wordsmyth Educational Dictionary-Thesaurus.(6-12)  This site is from the University of Chicago and is an online English dictionary with a built-in thesaurus. There is a words of the week features, lists of words related to a themes, and ESL list, a College Entrance list and a Language Lovers’ List and other related resources.

http://dynamo.dictionary.com  Word Dynamo  This stie has activities such as listening, matching and flashcards.  

http://www.yourdictionary.com/ Your Dictionary The Web's most comprehensive and authoritative language portal with every resource needed for language study in more than 300 languages.

 Taken from 50 Apps Students Will be Using in Your Classroom

  1. The World Factbook:
    iPhone fans with a penchant for all things geographical can download this annually-updated app (backed by the CIA!) for a quick look at information regarding every nation in the world.
  2. WebMD:
    Try not to slip into hypochondria mode, OK? Still, though, WebMD is a great app to keep on hand when trying to figure out a health issue.
  3. Black’s Law Dictionary:
    Be sure to download the latest edition and keep $54.99 on hand, because Black’s Law Dictionary stands as an essential download for anyone hoping to enter the legal field someday.
  4. Fooducate:
    Scan the barcode of any food product and receive detailed information about its nutritional value, as well as alternative purchases with more nourishing qualities.
  5. wikiHow:
    Learn how to do pretty much anything with more than 120,000 instructions uploaded by experts and non-experts from around the world.
  6. Google:
    Maps, Docs, Earth, Search (with enhancements!), and other offerings make life just that much easier to maneuver on the day-to-day.
  7. Dictionary.com – Dictionary & Thesaurus – Free:
    When the words just won’t come, that’s where this top-notch app (which also happens to be joyfully free) comes in and shines.
  8. Wikipedia:
    The ubiquitous open source encyclopedia is now available on the smartphone, thus ending arbitrary pop culture arguments much, much faster than before.
  9. Wolfram Alpha:
    Probably the app to end all apps, Wolfram Alpha hosts pretty much everything students need for both classes and to satisfy their own curiosities.
  10. TED:
    Watch some of the world’s greatest lectures from some of the world’s greatest minds from the comfort of a smartphone screen.

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 ENCYCLOPEDIAS
http://artcyclopedia.com Artcyclopedia Works of art and famous artists from history and the present
http://www.educationatlas.com Education Atlas.  The World's Largest Online Map of Education, Degrees, and Distance Learning Resources
http://www.si.edu     Encyberpedia. 
www.encyclopedia.com Encyclopedia
www.eb.com/ Encyclopedia Britannica Online
www.go.grolier.com Grolier Online.  A comprehensive online encyclopedia and reference resource
www.kidskonnect.com/content/view/383/27 Kids Konnect Encyclopedia
http://www.wikipedia.org Wikipedia
http://en.wikibooks.org/wiki Wikibooks
 http://en.wikionary.org Wikitionary
 http://en.wikiquote.org Wikiquote
 www.wikinews.org Wikinews
 www.wikisource.org Wikisource
www.worldbook.com World Book Online
http://worldalmanacforkids.com World Almanac for Kids Online
http://kids.yahoo.com/reference/encyclopedia Yahoo Kid's Encyclopedia

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THESAURSES

www.acronymfinder.com Acronym Finder
www.wordsmyth.net  The Wordsmyth English Dictionary-Thesaurus.
www.thesaurus.com Thesaurus.com. INTERACTIVE   Your online thesaurus.

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WIKIS
www.budtheteacher.com/wiki Bud Hunt’s Wiki

http://supportblogging.wikispaces.com/Education+Blogging Educational Blogging Wiki

http://schools.wikia.com/wiki/Main_Page High School Online Collaborative Writing

www.libsuccess.org Library Success:  A Best Practices Wiki

http://swarmsketch.com SwarmSketch

http://westwood.wikispaces.com Westwood Schools Wiki

http://en.wikibooks.org/wiki Wilibooks

http://wikipedia.org  Wikipedia  Wikipedia is written collaboratively by volunteers from all around the world. Since its creation in 2001, Wikipedia has grown rapidly into one of the largest reference Web sites attracting at least 684 million visitors yearly by 2008. There are more than 75,000 active contributorsworking on more than 10,000,000 articles in more than 250 languages.

http://meta.wikimedia.org Meta-Wiki - coordinates wiki projects

http://www.wikibooks.org Wikibooks  a collection of free educational textbooks and learning materials

http://commons.wikimedia.org Wikimedia Commons A collection of images, sounds, videos and general media - over 3 million files

http://en.wikipedia.org/wiki/Wikimedia_Foundation  Wikimedia Projects

www.wikiquote.org  Wikiquote

http://www.wikinews.org Wikinews

http://www.wikisource.org Wikisource translates free source documents

www.wikiversity.org Wikiversity resources containing research and educational activities and related materials

http://www.wikitionary.org - Wikitionary  a dictionary containing meanings, synonyms, etymologies and translations