- Compleat Lexical Tutor: This site provides a suite of tools for learners, researchers and teachers. In my opinion, one of the best options to create vocabulary activities based on a variety of corpuses.
- Flax: Interactive Language Learning: Flax "aims to automate the production and delivery of practice exercises for overseas students who are learning English".
- COCA: The Corpus of Contemporary American English allows you to create word lists, collocates, search phrases and N-grams.
I have also found that Google´s Wild Card [ " * "] is very helpful for working with the lexical approach. The asterisk represents any 4 words. Lexical or grammar patterns can be "discovered" by using a combination of words + the * within the "" marks. For example, find what collocates with : "* success".