Texture Maker 

Texture Maker is a seamless texture generator and designer. The application contains everything needed to create seamless textures for use in 3D rendering packages, game development, web graphics, image and video editing.
tiles textures backgrounds wallpaper generator image processing dtp 3d rendering raytracing games development maps levels

Genetica 

Genetica 2 is a seamless texture editor with over 500 texture presets and automatic seamlessness. Among hundreds of new features are a new Substance Lab, a new Weather Lab, a new Cut & Tile Lab, and much, much more. Also comes in Pro edition.
tiling wood metal stone texture textures graphics 3d material shader shaders seamless texture seamless textures