Anime Herald - anime, manga, industry, and associated culture

CoconatsuPLUS - scholarly(?) analysis of otaku culture

DenDen Garden - otaku culture

English Otome Games - exactly what's on the tin

FOND/SOUND - music blog

Hetamoé - scholarly analysis of "moe"; I don't like the AI usage here, but some of the writing is interesting

Sakuga Blog - insightful discussion centered around the anime production process

Yatta-Tachi - anime, manga, industry, and associated culture

Zimmerit - 80s-90s otaku culture and subcultures

Art Viewer - archive of contemporary art galleries and exhibitions

Empty Movement - wonderfully massive Revolutionary Girl Utena archival project

eSkeletons - visual database of our skeletal anatomy and those of our primate relatives

film/art gallery - technically the online storefront for a seller of vintage film posters, but most of the product images are scans of pretty decent quality

firstVIEW - extensive database of fashion collections' runway debuts

Fonts In Use - fonts archived through examples of their use in real typographic materials

Minitokyo - scans and wallpapers of manga, anime, art books, etc.

My Abandonware - playable library of older, otherwise inaccessible games

Old Book Illustrations - exactly what's on the tin

Posteritati - see: film/art gallery

Sakuga Booru - collection of noteworthy anime cuts

Settei Dreams - huge collection of anime production materials

Sprite Database - database of video game sprites

The Victorian Web - scholarly database of all things related to the British Victorian era

Video Game Music - exactly what's on the tin

Video Game Music Database - exactly what's on the tin

BluPetal - indie, focuses on BL/GL titles

Dark Horse - heavy hitter

Denpa - lot of seinen titles

Drawn and Quarterly

Fantagraphics - well-regarded comics publisher, releases lesser-known and older works

Glacier Bay Books - indie, focuses on little-known contemporary titles

Inklore - comics imprint of Penguin Random House

KANA - manga imprint of Abrams Books

Kodansha - heavy hitter

Manga Mavericks - indie

Peow2 - indie, just Stop!! Hibari-kun! for now

Seven Seas Entertainment - heavy hitter

Square Enix - no clue how to describe their catalog

Tokyopop - (former) heavy hitter, some focus on BL/GL titles

Udon Entertainment - art books, tie-ins, and... The Rose of Versailles?!

Uncivilized Books - new Mangalith imprint with Mizuno Hideko's Fire!

Viz Media - heavy hitter

Yen Press - heavy hitter