The Compleat Lexical Tutor is a long-standing vocabulary resource that has seen many developments, and remains a great resource for any language teacher. Developed by Tom Cobb, it is everything a teacher can ask for: quick, easy and flexible.
But this site is not just for language teachers. The tools offered will help a wide range of researchers that want help in examining the vocabulary of texts. As well as the VocabProfile, you can also find n-gram and other statistics, concordances, a programme to run priming experiments, and much more - with plenty added every time I visit. Plus, a little digging takes you to a lot more resources from the good work that Tom has been involved in for some time. Highly recommended. Keep up the good work Tom.