Big Five Mini-Test: Rate a variety of adjectives describing yourself to calculate your Big-5 personality type.
Find Your Star Wars Twin: Test to determine which Star Wars character is most like you, based on the Five-Factor model of personality.
Five Factor Personality Test: Describes an online version of Goldberg's five-factor personality questionnaire. Includes norms.
IPIP representation of NEO-PI-R: International Personality Item Pool (IPIP) representation of the NEO PI-R.
SimilarMinds.com - Big Five Personality Test: Free 55 question test.
The Big Five Personality Test: A modified online version of the Big 5 test used by U. C. Berkeley psychologist Frank J. Sulloway for birth order research. The test takes about 10 minutes and provides online results.