What is some free photo editing software?

Picnik or lunapic are great free web based (nothing to download) editing tools. If you need/want more features downloading GIMP is a great options. There are also free tools to add text blurbs, to make collages, to put your photo into other images. There are a number of tools that allow you to put the image of a face into other photos for some fun creations.

ImageCoffer.com, offers a free online photo sharing and photo editing.

Irfanview is supposed to be very good (Windows). GraphicConverter is recommended for Macintosh. Double-click their names for more information.