All kinds of activities
Grammar and activities for students of English
Lots of exercises (verbs, listening comprehension, grammar, vocabulary, songs etc.)
https://learningapps.org/index.php?category=3&s=
An internet meeting place for learners of English
Grammar exercises and quizzes, reading room and vocabulary
Private website by an English teacher living in Germany.
Made for children, but nice exercises and information.
Grammar and vocabulary exercises
Highly recommended! Text, audio and video, on-line grammar, e-mail service
http://www.bbc.co.uk/worldservice/learningenglish/index.shtml
Wonderful British Council site. Lots of exercises at all levels.
Links for kids, professionals and teachers.
http://www.learnenglish.org.uk
A nice website on energy efficiency for kids and teachers
http://www.energyhog.org/adult/adults.htm