This is a shareware application for generating textures of very high quality.
This is a freeware texture generator that is able to generate some interesting textures.
A free utility for creating seamlessly repeating wood textures.
In my opinion the best digital imaging program available. The price may not be in range for most individual developers, but a company shouldn't have much trouble purchasing it.
Project Dogwaffle & PD Pro Digital Painter
Low cost painting program. Version 1.2 is free, though obviously lacking a lot of the features from the later versions.
Excellent open source paint and image manipulation program.
A lightweight painting program. Not as powerful as Photoshop or Painter, but quite capable, and better yet, it is very cheap. There is even a free version for those that don't want to pay the 20 dollars.
A PhotoShop plugin for generating seamlessly tiling filters. The site also has a large library of procedurally textures for viewing.
Texture Maker 3
Seamless texture generator tool.
Free drawing program for vector graphics.
This is a freeware tool for generating procedural textures of very high quality.
.werkkzeug 3 TE (texture edition)
A free tool for procedurally generating textures. The engine for generating the textures can be licensed for a rather steep price so that it can be embedded in applications.
2D texturing tool