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Genetica is a powerful node-based texture generator for making tiling or seamless textures for games or other 3D work.

PixPlant is a smart texturing app with the best tools to quickly transform a photo into seamless repeating textures and 3D maps.

Patternshop is a tool to create textures for fabric design.

Substance Designer is a node-based non-destructive application for material authoring. Edit complete texture sets fast with the non-linear workflow and see your changes apply simultaneously to all your outputs.

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.

NeoTextureEdit is an open source (GNU LGPL v. 3) easy to use graph-based procedural seamless texture editor. Using continuous basis functions it can generate arbitrary resolution images without quality degradation. Its main purpose is to produce high quality textures for real time rendering applications that can be stored in a few kB and synthesized on application startup. But it can also be used to generate off-line images.

Texture Studio is all you need to produce professional quality textures for use in games and tiled backgrounds. Texture Studio includes a set of integrated tools, all extremely useful for creating high quality seamless textures. Texture Studio is so easy to use, a photograph can be converted to a smoothly tiling, seamless texture with a single click. Alternately, you can adjust settings to fine-tune the look of the results.