I've been reading some american graphic novels lately, but don't know of a good database where they're listed. What is a website with similar tag and genre searching features but for non-manga graphic novels?

https://comicvine.gamespot.com/alan-moore/4040-40382/
I set it to the entry on Alan Moore to get you going. Use the wiki tab, and obviously the search function. The site is a better database than MU or MAL once you figure it out.

I also read EU/US comics and am a librarian.
Manga-Masters, My ANN-Lists + Imdb