art http://www.dcielts.com/ielts-vocabulary/art-vocabulary-and-exercises/
technology http://www.dcielts.com/ielts-vocabulary/technology-vocabulary/
family http://www.dcielts.com/ielts-vocabulary/family-vocabulary-and-exercises/
http://www.examenglish.com/vocabulary/B1_vocabulary_topics.htm
http://www.examenglish.com/vocabulary/b1_buildings.htm
http://www.manythings.org/vocabulary/lists/c/
http://www.dcielts.com/ielts-vocabulary/
An interactive dictionary
http://www.word-raider.com/dictionary/index.php?word=associate&level=5#associate