I knew about crazybump, but is there something to convert the grey BO1 normal maps to the tangent space ones? Or can you do this with crazybump too?

as far as i remember, crazybump can generate normal maps and specular maps using the original texture.

as far as i remember, crazybump can generate normal maps and specular maps using the original texture.

Ambient Occlusion, Diffuse, Normals, Specular, Parallax, Crazybump does a ton of maps, as long as you upload a normal or diffuse map it generates the rest, except for generating a diffuse from a normal.