You can find here 1650+ doom3 textures converted to oldgen engine texturing (no normal, height or spec maps).
(they are available as individual PNG and zipped paks)
(edit 2022-05-30 : link bellow has been updated)
> > D3RetroTex on GoogleDrive
You can use these freely, have fun, no credits needed, excepted maybe for the awesome id's artists =)
-Adrian Carmack
-Kevin Cloud
-Andy Chang
-Pat Duffy
-Seneca Menard
-Kenneth Scott
-Patrick Thomas
-Ted Anderson
-Pat Jon