Found this, possible good plugin for tileable texturing

http://www.filterforge.com/download/

That is totally amazing.

Filter Forge for Mac OS X has been released. This should be interesting for all Mac texture-makers.

A short list of features: seamless textures up to 65k*65k pixels, HDRI lightings, support for bump/normal maps, optimized for multi-processor computers, and nearly 6000 ready-to-use filters.
Filter Forge requires Mac OS 10.4 or higher.