Just a couple of cool tests:

• NY Times USA Dialects Quiz is a neat test that comes with maps in the results.
• Are You a Natural Social Psychologist? is a good test about social psychology and people.
• Thinking Modes test tests your internal verbalization, visual imagery, orthographic memory, and representational manipulation.
• Mind's Eye/Aphantasia test is neat and tests whether you have aphantasia, the inability to visualize things in your mind. Some people don't have visualizations in their brains, and this helps determine how good your internal visualization is.
• Reading the Mind in the Eyes (RMET) test tests your ability to detect emotion in grainy, awful pictures of people's eyes.
• Empathy and interpersonal reaction test tests your empathy, essentially.
• Divergent Association test tests your verbal creativity abilities (permit me one smol brag: scored 93.47, higher than 98.97% of people).
• Inventory of Phonetic Associations is a strange verbal test determining whether you associate nonsense words with certain characteristics, which is apparently a thing.
• EasyDamus DnD Alignment is a very neat, very old Dungeons and Dragons alignment test.
• Archetypes Test is a neat Jungian archetypes test.

I also have a list of personality system tests also available, on a different post.