From ShiVa Wiki
..:: 2D/Images Tools ::..
TheGIMP - GNU Image Manipulation Program
Paint.NET is free image and photo editing software for computers that run Windows. It features an intuitive and innovative user interface with support for layers, unlimited undo, special effects, and a wide variety of useful and powerful tools. Useful for Creating and editing Textures. Visit Homepage
An exellent 2D editor. Freeware, Opensource, pluging, LUA scripting and more. Well Really perfect and fast for doing your texture. It's to simulate natural brush tools. It is therefore suitable to leave your creativity free run. Artweaver offers you a clear program window, which can be used without training immediately. Visit Homepage
..:: Texture Generation Tools ::..
|Genetica is the latest seamless texture, animation, and HDRI environment map editor.|
|This tool creates Sphere Maps for (fake) reflections out of 6 single images (cubemap).|
| xNormal is an application to generate normal / ambient occlusion / parallax displacement and relief maps. It can also project the texture of the highpoly model into the lowpoly mesh ( complete texture transfer, even with different topologies ).
Includes too an interactive 3D viewer with multiple mesh and textures format support, shaders and realtime soft shadows / glow effect. To finish, comes with some useful tools like height map - normal map - cavity map - occlusion - tangent/object space tools. Visit Homepage
|Crazy Bump is little but very powerfull tools to create your normal map for all your model.|
|ShaderMap Pro automatically converts photographic textures to height, normal, ambient occlusion, dudv, and specular maps in seconds.|