Some useful links and resources

Enneagram

A trustworthy site for all things enneagram, including a test to self-type, is the Narrative Enneagram

I often share this app with clients, as it is both handy, accurate, and easy to share with friends https://enneaapp.com/

Another free test is available here https://www.personalitydata.org/enneagram/free-enneagram-test