Dave's ESL Cafe Quiz Centre
Wide variety of interesting quizzes on vocabulary, grammar, idioms as well as history, geography, etc.

In-House Quizzes
A varied set of online activities with a focus on grammar from John Wong at City University.

Internet Anagram Server
Fun site that produces anagrams for any word or phrase (try putting your name in).

Osiris Trivia Quiz
A weekly 25-question trivia quiz on a wide variety of subjects. Answers are emailed in and winners posted each week.

Self Study Quizzes for ESL Students
Masses of quizzes from the Internet TESL Journal on a wide variety of topics as well as grammar, vocabulary, idioms, etc.