Are you interested in buying or just looking for one for free?
I got an ArcSoft PhotoSuite 5.5 CD free with my Canon all-in-one photo printer. The clone tool & smudging tool are invaluable for correcting blemishes and filling in spots, or erasing sections, so areas look flawless. I've gotten rid of flyaway hairs & the background looks seamless. I have lightened dark frown lines, due to bad, downcast lighting in pics, that aren't as bad in real life.

I have smudged out a few wrinkles.
I haven't used another program as I don't want to go through a learning curve again, trying to figure out buttons & features. I have heard some programs like Photoshop are harder to learn at first, but there is more you can do with them in the end. And more Photoshop forum support.
There is a free, 15 day trial download for it at CNET.com.
http://www.download.com/ArcSoft-PhotoStudio/3000-2192_4-10376167.html
You can also Google to read the reviews. I think there's some at
Amazon, too. Then if you want it, it's $79 to buy the expanded version. Don't know if that's any different from the free CD I got.
Maybe a friend has a newer camera or photo-quality printer and has a CD of a photo editing tool they an loan you to install a program. Beats $79.