>>1800912Booru's mostly have the same pool of pictures. But you're not wrong to ask.
start with
iqdb.org. It's actually the opposite of a booru, in that you can use it to search an image. Use it on any picture you like, follow it back to a list of every booru it appears on, then search that booru for related pictures and tags.
After that there's
Gelbooru -danbooru sister site
Zerochan -smaller database, but a few exclusives
Pixiv -high quality
Sankakucomplex -attached to a useful otaku/ecchi News site
Konachan -exclusively filled with wallpapers.
