300+ matcaps/litspheres for Zbrush, Blender, 3ds Max, Maya, Houdini, 3dCoat, Mudbox, Cinema4D, etc. Basically any program that supports matcaps/litspheres.
Two flavours, one that mimics a surface roughness of ~0.3 and one at ~0.5
Comes in .exr and .png