I know how to make good seamless textures, and I know how much time it costs, and I know how much time I saved with Seamless Texture Generator.

Yes it resumes pretty well the situation smile
I use only open source and free tools, so Photoshop is not an option for my case.

Just do It !!

http://independentcreator.over-blog.com/pages/3D_Models-7792999.html