It's the program i use, appropriately (sp?) named "Texture Maker". I'll look around in it, see if i can find the website.
What i've got is sort of a Trial Version. Though, even after the 30 days it still works fine, but you can't save anything after the 30 days are up (that is, if you save from the File dropdown menu. If you close the texture, it allows you to save in the "Do you want to save before closing?" window thingy. Even then, it won't allow to to save any texture bigger than 255x255, but there's a function in the program that allows you to split the Texture into tiles, then you can just put them back into 1 picture in another program. And it works on Textures bigger than 255x255 :3), you can't copy anything to the clipboard, and every now and then a little window will pop up saying "The 30 days expired a while ago Blah Blah Blah".
Anyway, it's pretty good, as long as you know what you're doing. There's a bunch of stuff just in the version i have (mine's a few years old, i haven't checked if there's any new versions or anything), and i'm still finding new ways to apply the functions.