TechnicallyArt - Community for technical art ( suppo.fi )
Community for technical art - shaders, modeling, rigging, etc....
Polygon Graphics - For vaguely technical things about old 3D consoles and such ( suppo.fi )
Bring your PlayStations and Dreamcasts....
/c/dingusland - Dankpods and related things ( suppo.fi )
Links:...
Photoshop Nonsense - self-explanatory name ( suppo.fi )
I used to practice this art actively....