From Reichert Software Engineering:
Generate and draw seamless textures from scratch and convert any image into a seamless tile with Texture Maker in seconds. Modify existing textures without the danger of adding seams like caused by standard image editors. Natural textures like soil, flagstone, cracked earth, gravel, wood, rock, grass are no problem. Structured patterns like checkerboards, bricks, tiles, scales require only a few clicks. Feed the program small material cutouts and have it compute large seamless textures from them. Extract parts from photos with perspective correction of the extracted texture. Combine multiple materials and render complex textures with realistic illumination and shadows. Create texture animation loops and special effects. Additionally export your textures as normal maps, transparent images and AVI files. Automate work with scripts and batch processing.