Not sure where to put this, it's for textures so might as well be here.
This little tool takes a square .bmp image and can make it tile. You can set a few parametres before using it for better outcomes. The results are pretty nice, could save a lot of time in Photoshop I guess. Has 3 different methods of "blending" the seam, not really tried it too much but it's pretty useful.
I didn't make this, was designed for CS Mapping by
Nemesis.
Download: Auto Seamer 1.01