Wordle is easy to use.
VocabGrabber – is a tool that may be more useful in a classroom (http://www.visualthesaurus.com/vocabgrabber/). While it lacks the flashy pictures and clouds that Wordle can create, it has substance in creating lessons that can be used to really understand a word passage. VocabGrabber analyzes text and generates lists of the most useful vocabulary words then displays how those words are used in context. Copy text from a document and paste it into the box, and click Grab Vocabulary! VocabGrabber will automatically create a list of vocabulary from the text, which can be sorted, filtered, and saved. Click on any word in the cloud and a snapshot of the Visual Thesaurus map appears along with definitions for that word, and examples of the word in the text. The trial version is limited but a lesson can be created easily. Subjects include academic areas of interest (Arts & Literature, Science, and Social Studies), names of historical figures and places (People and Geography), and words that are of particular importance for language learners at all levels (Vocabulary).
Wordsift has a handy feature in that you can drag a picture into the text you paste.
Cf. http://www.wordsift.com/
http://www.abcya.com/word_clouds.htm is the most colorful.
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