http://www.uoregon.edu/~sanjay/bigfive.html

Information on the five-factor personality model administered by the University of Oregon.

http://www.personalitytest.org.uk/

Online test to allow people to measure their personality using the 5 Factor model.

More reading can be done following this link: https://positivepsychologyprogram.com/big-five-personality-theory/

https://www.16personalities.com/free-personality-test

Another personality test the 16 Personalities test.

A description of the 16 Personalities can be found here:

http://www.personalitypage.com/high-level.html