Dawntrail Shader Reference
Substance Painter export and colorsetting resources by SB! Youtube guide is here
glTF validator for Penumbra imports
Custom body resources:
Note: I wont link the actual devkits here since they change relatively often, you'll need to join the respective bodies discord (most likely) to get the up to date devkit, I'm including TBSE stuff here tho because finding any is a crapshoot
C.K.'s Porting Tool Documentation Note: Don't actually use the blender file, but it gives you a good idea of what your workflow for upscales should look like
Tre Devkit guide by S.B.!
YAB Devkit guide by Aleks w/ Yet Another Addon docs
Bimbo Devkit overview
Google Drive with TBSE-W assets
Blender file for the TBSE and TBSE-X devkit with IVCS 2.0 support