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.
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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.
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HyperTyle 

HyperTyle is a sophisticated filter plugin for generating texture, surface, paint, erosion, transparency, edge, frame and shadow effects. These main effects are based on seamless textures, so there are unlimited variations possible.
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