XnView

When it comes to photo editing, it doesn't get any better than free--particularly if the tool has a reasonable amount of editing tools. And that's what XnView program has. You'll be able to resize, crop, correct red eye, flip, rotate, and perform a wide variety of image adjustments, including for brightness, contrast, and gamma. It will also convert your pictures among many different image formats. It's not a powerful photo tool like The GIMP, but for most work, it'll do just fine. And you can't argue with free.

---Preston Gralla