Sp2Blend: Substance Painter Shader is a Blender node group built as an all-in-one way to import textures from Substance Painter. It grew out of BlenderBrit's PBR Pack and keeps its focus on Substance Painter's metallic/roughness workflow, though it can also be used for any metallic/roughness setup.
Textures produced by Substance Painter's default metallic/roughness workflow can be used directly without alterations. Load the base color, metallic, roughness, MixedAO and normal_opengl maps, connect them to the shader, set everything except the base color to non-color data, then adjust with the available options. The node group also includes fresnel and rim lighting, based on work shared by cynicat pro.
It was built for Blender 2.7x using the Cycles render engine and carries a royalty-free license. Documentation is included, and a demo video is available.