All Levels

• Fun Quizzes: http://www.aitech.ac.jp/~iteslj/quizzes/vocabulary.html
• Word Puzzles: http://www.funbrain.com/detect/
• Interesting Crossword Puzzles: http://iteslj.org/cw/

　

Easy Level

• The 1000 Most Common Words:http://esl.about.com/library/vocabulary/bl1000_list1.htm?once=true&
• How the Alphabet Developed: http://www.wam.umd.edu/~rfradkin/latin.html

　

Intermediate Level

• Communicative Test: Made for Japanese University Students: http://home.hiroshima-u.ac.jp/katsuiwa/english/list.cgi
• Slang: http://www.eslcafe.com/slang/slang.cgi?
• Homonyms: http://www.quia.com/custom/1055main.html
• Lots of Fun Activities: http://a4esl.org/a/v5.html

　

Advanced Level

• TOEFL Vocabulary Practice: http://esl.about.com/library/quiz/bltoeflquiz.htm?once=true&
• Common Errors: http://www.wsu.edu:8080/~brians/errors/errors.html