YDC
Pardon the dust, this site is still in an early beta stage.
This is a catalogue of yaoi artists utilizing paywalled content.
Here you can find links to the relevant shops (or platforms effectively used as shops, such as Patreon), official media galleries (Pixiv and alike), and places where you can preview the exclusive content before deciding if the stuff's worth your money, such as scrapers and community-maintained drives.
AhrStudio
A group comprised mainly of Anrick (爆漿魷魚) and Masayoshi (冨樫正義)
Anrick's pixiv Anrick's Twitter Anrick's HicceArs Masayoshi's pixiv Masayoshi's Twitter
Dizdoodz
working on a Crown's Reverie game
Patreon Crown's Reverie Patreon
lvlv
associated with the Paradiso Guardian (PG) game
Mikkoukun
associated with Camp Buddy and BLits Games IPs
GDrive-ba (stale, 2017) GDrive-ln (CGs) ADF mirrored drive GDrive-yc (CGs, most complete) Dropbox GDrive-sb (CGs)
Nukobao
aka ぬこばお, NUKOBAOTH, baox; associated with Wasukoro (わすころ) circle
OdinCG
aka OdinComics, BadOdin
Booth Patreon Fanbox Fantia Digiket SubscribeStar Website (BadOdin) Website (OdinCG) Patreon (BadOdin)
ADF mirrored drive #1 GDrive ADF mirrored drive #2 ADF mirrored drive #3 ADF mirrored drive #1 (FTP) ADF mirrored drive #2 (FTP) ADF mirrored drive #3 (FTP) GDrive-dd (BadOdin)
PenguinFrontier
aka ペンギン屋
ADF drive GDrive ("CLASS. ALPHA" FF fanbook) GDrive-yc (Vane x Lancelot Set)