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Maybe you've heard of GIMP and maybe not but it's one of our favorite free programs for images.
We use it for logos, avatars, icons and any sort of image stuff we need to do. As Photoshop is so expensive, this free program that does just about everything that Photoshop does, is a great alternative.
We found that many of the Photoshop tutorials also work for GIMP.
Might want to give it a try next time you need to make or change images.