I recently stumbled across Kimberling's Encyclopedia of Triangle Centers database of points called Kimberling centers, which seem to be points defined relative to a triangle. Among them are some famous, relatively useful points, like the incenter and orthocenter.
But the database as of now has $33,504$ Kimberling centers defined. Many of them have no information on them except their definition and a large list of lines between other Kimberling centers on which they lay. Others don't even have that, and are just an arbitrary definition. I can't see how almost any of these could ever be useful; do they have any purposes that you know of?
Honestly, I've never used nor read any definition of ETC points from $20000$ up but the biggest advantage of this encyclopedia is when you know how to construct some triangle centre (which you encountered trying to solve some geometry problem) and want to know something about its properties. Then the $6$, $9$, $13$ search that ETC provides really helps.