The BBC has a website dedicated to learning for adults. Most of the language resources are for Spanish, French, Italian, German, and English as a second language. Resources include online language lessons, spelling and grammar exercises, a monthly newsletter, and timely articles about culture.
Browse the available resources at http://www.bbc.co.uk/learning/adults
Read a positive review of this website’s usefulness for English language learners at http://larryferlazzo.edublogs.org/2011/12/08/bbc-learning-for-adults-is-a-treasure-trove