Queendom: The Land of Tests
Queendom.com provides several tests and quizzes related to personal issues. Although basically meant for entertainment, these tests give a fair idea of the different aspects of our personality.
International High IQ Society
The International High IQ Society offers five free IQ tests that measure different aspects of intelligence. Good for getting a general idea of your brainpower!
Psychological Tests and Quizzes
Dr. John Grohol's Psych Central website provides many self-help quizzes related to mental health which can help you determine whether you have symptoms commonly associated with the various mental health disorders.
Personality Tests
This website offers a few personality tests, the most highly recommended of which is "The Big Five Personality Test" which measures the basic dimensions of personality.
Implicit Association Test
The Implicit Association Test (IAT) website provides an opportunity to interested individuals to gain greater awareness about their own unconscious preferences and beliefs. The IAT measures implicit attitudes and beliefs that people are either unwilling or unable to report, but which may affect the way they respond to other people.