The Open-Source Psychometrics Project, which seems to have been around for a while, provides personality quizzes as an exercise in data collection and personality education:
This website has been offering a wide selection of psychological assessments, mostly personality tests, since late 2011 and has given millions of results since then. It exists to educate the public about various personality tests, their uses and meaning, the various theories of personality and also to collect data for research and develop new measures. This website is under continuous development and new tests and information are being added all the time.
One of the more recent quizzes matches your personality with fictional characters, and the results seem oddly close? I took the short version, and out of 2,000 characters, I was a 92% match to Data from Star Trek. I’m not totally sure how I feel about that.
You can also download anonymized data collected through the project.