Check out the /aco/ 3D General: >>>/aco/catalog#s=3D

Previous thread:
>>4966446 (You) (Cross-thread)

Torrent:
>https://sukebei.nyaa.si/
>https://sukebei.pantsu.cat/
>https://www.tokyotosho.info/
>https://www.google.com/

XDCC:
>http://erogames.website/ (a.k.a. SANIC_HEGEHOD PACKLIST)
Tutorial:
>http://horriblesubs.info/irc-guide/

Multi part free:
>https://discordapp.com/invite/9DeM4Zp
>https://hentaibedta.net/

Multipart pay accounts:
>http://www.anime-sharing.com/forum/

Streaming:
>http://ohentai.org/tagsearch.php?tag=3D
>http://miohentai.com/tag/3d-hentai
>http://hentai-for.me/3d-anime-online/

Non-exhaustive list of circles that are still somewhat alive:
>https://pastebin.com/SgT7193z (embed)

Source of OP picture:
>http://www.dlsite.com/maniax/work/=/product_id/RJ222377.html