...Or, at least new to me.

http://e621.anthro.fr

I am confused by this. If anyone has information involving it, could you share?

Seems like a project that creates a slideshow of tag searches.

Here's the OP: https://e621.net/forum/show/176991

Interesting. One feature I noticed is that, like FA, it restricts the image's loading, making it a bit better for mobile users. Since it is a "slideshow", it might also be useful for checking minor details in determining duplicates.