Substance Painter 

Add realistic textures to paint your 3D creations. Use a broad variety of designing materials and brushes. Work with multiple workspaces, including the brush chooser, a collection of texture, and materials selection. Apply tear and wear, scratches and dust textures, have mask presets adapted automatically, and bake high-quality maps using substance painting tool.

Substance Painter is an advanced 3D painting application. It is quite easy to use; just choose your brush, select a material, tweak it if needed and then start painting. Each stroke applies all channels at once in real time with each map going up to 4K resolution. You can preview your painting in a Physically based (PBR) viewport for accurate material feedback. Also you can import your own custom shaders and create your own channels to paint on.