Enter a list of English words, and this app generates definitions, a multiple-choice quiz, flashcards, worksheets, and synonyms. Flashcards and worksheets are for printing out.
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Limitations: English only
Dictionary that offers definitions, synonyms, antonyms, example sentences, pronunciations, and translations between English and several languages (German, Dutch, French, Italian, Portuguese, and Spanish). Many other options.
This site allows you to see detailed information on the top 60,000 words (lemmas) of English, based on data from the Corpus of Contemporary American English (COCA).
You can see the overall frequency for each word, as well as the frequency of words in different kinds of English -- spoken, fiction, magazines, newspapers, and academic writing. For each word you can also find the 20-30 most frequent collocates (nearby words) and see 200 or more concordance lines (words in context). You can also see a list of synonyms and (from WordNet) words with more specific and more general meanings, and in all of these cases you can click to see the entries for those related words as well.
An innovative approach to studying kanji that organizes kanji by usefulness, teaches radicals, explains nuances between synonyms, and employs mnemonics.
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