Free stuff

Alizea3D

Archive3D

Bagginsbill

Cage (scripts)

Catamaran (Black Widow, et al)

Dawid Michalczyk (textures)

Digital Creations

DMI (car models)

InLite Studio

NASA (printable models)

Ockham (scripts)

PoserDirect

Poser Orphans

ShareCG

sIBL Archive (HDRI sets)

SnowSultan (seam guides)

Textures.com

Treasure Chest

Ziggies Model Emporium