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Visuwords™ online graphical dictionary - Look up words to find their meanings and associations with other words and concepts. Produce diagrams reminiscent of a neural net. Learn how words associate. Enter words into the search box to look them up or double-click a node to expand the tree. Click and drag the background to pan around and use the mouse wheel to zoom. Hover over nodes to see the definition and click and drag individual nodes to move them around to help clarify connections. *It's a dictionary! It's a thesaurus! *Great for writers, journalists, students, teachers, and artists. *The online dictionary is available wherever there's an internet connection. *No membership required.

Like Google Earth for the heavens, WWT aggregates terabytes of astronomical data from the world's biggest telescopes to create a single virtual scope that anyone can look through. WWT is not a model of the known universe, but rather a centralized repository for just about everything known about the universe. The idea is to democratize the science of astronomy with a single tool that can be used by students and scientists. Who knows, when everyone has access to the same data, maybe the next big discovery in astronomy will be made by an amateur? There are hundreds of terabytes of digitized sky - enough data for everyone Read more: http://www.time.com/time/specials/packages/article/0,28804,1918031_1918016_1918007,00.html #ixzz1RRSH4taN

is a free service that describes itself as "half vocabulary builder, half dictionary, and full awesome." Word Stash is pretty true to its self-description. At its most basic Word Stash is a dictionary that provides contextual examples to support the definitions offered. For many words, Word Stash provides an audio pronunciation. The vocabulary builder aspect of Word Stash lies in the fact that users can create accounts in which they create and save lists of words to study. Users can create as many lists as they like and expand existing lists as they go. Word Stash provides short quizzes based on the words a user puts into a list. In creating the study quizzes, Word Stash uses a spaced repetition algorithm to present users with words based upon how often they answer correctly or incorrectly. To create a list of words users simply need to click "stash" anytime they view a word in the Word Stash dictionary. Users can also share lists and study other users' shared lists

is a free visual, video dictionary. Wordia features a selection of user-submitted and professionally created videos explaining the meaning of a word. The videos focus on the everyday use of words while the text accompanying each video provides the dictionary definition of the word. The video below explains the word literacy.