What's here these days...
529 (so far) Free, Abstract, Tiling, 3D
Each set contains 2 diffuse maps (neg image of each other), 2 normal maps (inverse of each other), and 6 assorted, interchangeable greyscale maps, which means there are 10 textures in every texture set. So 5,290 free textures in total so far.
for anything to do with the 3d textures
for anything else