Toribash
Lots of people use Photoshop. Gimp is a pretty good free program that you can use aswell.
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If you took a look at the stickies of this board before posting you would've found this thread: http://forum.toribash.com/showthread.php?t=487516
It has almost all programs listed that are used by people and it has all pros and cons summed up next to it, you can try some out and make a decision yourself.

And when making a thread in this or any other board, please try to have a little bit a constructive title, a title like 'help' doesn't really describe your question.
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