Seamless Factory - description from Softdepia.com:
Seamless Factory is easy to use texture maker which is intended to transform any image to a seamless pattern with improbable accuracy. The program will be useful for creating website backgrounds, program skins and original wallpapers, also it may be used in 3D modelling. Moreover the application contains commands for image correction which come in handy after scanning or image processing.
Seamless Factory is a "Free to try" program. You can download and try it for an evaluation period.