Lingro is a site that offers a useful translation tool. Enter the URL of a site or page, then choose the language you want to translate words into and you can click on the words you don't know and bring up a pop-up box with a translation.
Professor Mark Davies of the Brigham Young University set up a superb site to access the British National Corpus (BNC). Easy to use, fast, packed with features and intuitive, it is by far the best concordancer on the web in my opinion.
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BobK on More brilliance in Corpus Linguistics: