Union Bytes Painter - 2D sprite and low res texturing tool for editing with color, normal, height, roughness, and metallic maps.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Zero Brush - blendersensei.com/zero-brush Texture painting, sculpting, and baking addon for Blender.
ZBrush - ZBrush is a digital sculpting and painting software solution.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Mudbox - Autodesk Mudbox digital sculpting and texture painting software provides 3D artists with an intuitive toolset for creating highly detailed 3D geometry and textures.